This part matters because every other giant passage in the Bible looks back to it. Genesis 6:1–4 is four verses long, and it has generated more argument per word than almost any passage in Scripture.
The text
"And it came to pass, when men began to multiply on the face of the earth, and daughters were born unto them, That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose." (Genesis 6:1-2)
"And the LORD said, My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years." (Genesis 6:3)
"There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of renown." (Genesis 6:4)
Then, immediately, the reason for the Flood:
"And God saw that the wickedness of man was great in the earth, and that every imagination of the thoughts of his heart was only evil continually." (Genesis 6:5)
"The earth also was corrupt before God, and the earth was filled with violence. And God looked upon the earth, and, behold, it was corrupt; for all flesh had corrupted his way upon the earth." (Genesis 6:11-12)
Notice where Moses put the giants. They are not in a book of legends or an appendix. They sit between the genealogy of Adam's line in Genesis 5 and the Flood in Genesis 7, as part of the account of why God judged the world.
The words
Three Hebrew words carry the passage.
"Giants" in Genesis 6:4 translates nephilim (Strong's H5303). Strong defines the word as "properly, a feller, i.e. a bully or tyrant", from the verb naphal (H5307), to fall.1 The King James translators rendered it "giants", as the ancient Greek translation had done. Some modern writers make much of the root and translate "fallen ones". The root is real, but the word's meaning is settled by its only other appearance, Numbers 13:33, where the nephilim are men so large that the spies felt like grasshoppers beside them. Whatever the word meant in its origin, in Scripture it describes men of great size and strength.
"Mighty men" translates gibborim (H1368), "powerful; by implication, warrior, tyrant". It is the word used of Nimrod, who "began to be a mighty one in the earth" (Genesis 10:8), and of David's mighty men.2
"Sons of God" translates bene ha-elohim. This phrase is the heart of the dispute.
Three readings of "the sons of God"
Christians and Jews have read "the sons of God" in Genesis 6 in three main ways. All three are old. All three have been held by serious men who loved the Scriptures.
The angelic reading
The oldest reading on record is that the sons of God were angels who left their place and took human wives, and that the giants were their children.
It is the reading of the Book of the Watchers, the first part of 1 Enoch, which many scholars date to the third century before Christ and which was found in Aramaic among the Dead Sea Scrolls.3 It is the reading of Jubilees, a retelling of Genesis from the second century before Christ. It is the reading of Josephus, the Jewish historian writing near the end of the first century after Christ, who says plainly: "For many Angels of God accompanied with women, and begat sons that proved unjust, and despisers of all that was good; on account of the confidence they had in their own strength."4 And it is the reading of the earliest Christian writers who comment on the passage. Justin Martyr, writing in the middle of the second century, says that "the angels transgressed this appointment, and were captivated by love of women, and begot children who are those that are called demons".5
The case for the angelic reading from Scripture itself rests on four points.
1. The phrase. Elsewhere in the Old Testament, "the sons of God" names heavenly beings. "Now there was a day when the sons of God came to present themselves before the LORD, and Satan came also among them" (Job 1:6). At the creation, "the morning stars sang together, and all the sons of God shouted for joy" (Job 38:7), before any man existed to sing. 2. The contrast. Genesis 6:2 sets "the sons of God" against "the daughters of men". If both groups were simply human, the contrast is strange. 3. The result. Ordinary marriages between two human families do not produce nephilim. The text treats the offspring as something remarkable. 4. The New Testament. Peter and Jude both speak of angels who sinned and are now held in chains, and both set that sin beside the Flood or Sodom. "For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment; And spared not the old world, but saved Noah the eighth person, a preacher of righteousness, bringing in the flood upon the world of the ungodly" (2 Peter 2:4-5). Jude is sharper still: "And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire" (Jude 1:6-7). "In like manner" ties the sin of those angels to the sin of Sodom: fornication, and "strange flesh". And Jude, a few verses later, quotes Enoch (Jude 1:14-15), so he knew the Enoch tradition and its reading of Genesis 6.
The main objection is the Lord's word about the resurrection: "For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven" (Matthew 22:30). The answer usually given is that the verse speaks of "the angels of God in heaven", angels who keep their place, while Jude speaks of angels who "left their own habitation". Scripture also shows angels appearing in bodies that eat and can be touched (Genesis 19:1-5; Hebrews 13:2). How more than that was possible the text does not say.
The Sethite reading
The second reading is that "the sons of God" were the godly line of Seth, and "the daughters of men" the women of Cain's line. On this view Genesis 6 describes the collapse of the faithful family into the ungodly world by intermarriage.
This reading appears in Christian writing by the early third century. Julius Africanus, in a surviving fragment of his Chronography, writes that "the descendants of Seth are called the sons of God on account of the righteous men and patriarchs who have sprung from him". The Greek copy he quotes read "the angels of heaven", and he notes, "In some copies I found the sons of God."6 Augustine, in The City of God (written over the 410s and 420s), weighs the question carefully and concludes that "the sons of God, who were according to the flesh the sons of Seth, sunk into this community when they forsook righteousness".7 He adds that he "could by no means believe that God's holy angels could at that time have so fallen".8 Through Augustine this reading became the common one in the Western church for many centuries.
The strength of the Sethite reading is that it fits the movement of Genesis 4 and 5, which do trace two lines, and it avoids the difficulty of angels marrying. Its weakness is that Genesis never calls Seth's line "the sons of God", that it gives no reason why Sethite fathers and Cainite mothers should produce giants, and that it was not the first reading of the passage.
Augustine himself was honest about the difficulty. In the same chapter he reports the widespread belief of his day that spirits had assaulted women, and says the belief is so commonly affirmed "that it were impudent to deny it", though he would not decide what kind of beings these were.9 He also argues that giants might have been born before the sons of God took wives at all. He was not a man who dismissed the giants. He believed in them, as Part 6 will show.
The rulers reading
The third reading is that "the sons of God" were kings or nobles, great men who took whatever women they wanted. The Aramaic paraphrase of the Torah known as Targum Onkelos renders the phrase "the sons of the rulers", literally "sons of the great ones".10 The rabbinic commentary Genesis Rabbah records that Rabbi Shimon ben Yohai, a teacher of the second century after Christ, called them "the children of judges", and that he "used to curse anyone who would call them" the children of God.11
That curse is worth noticing. A teacher does not curse a reading nobody holds. Rabbi Shimon's anger is itself evidence that the angelic reading was widespread among Jews in his day, and the rulers reading seems to have been, at least in part, a reaction against it.
Where I stand
I believe the sons of God in Genesis 6 were angels who left their first estate (Jude 6), and that the giants were real. This is my conviction; weigh it for yourself. The phrase "sons of God" means heavenly beings where the Old Testament uses it elsewhere; Peter and Jude speak of angels who left their place and sinned in a way tied to the days of Noah and to "strange flesh"; and it is the oldest reading we have, held by Jews before Christ and by Christians in the generations after the apostles. Good men, Augustine among them, have read it otherwise, and nothing in the gospel hangs on the answer.
What does not depend on the answer is the plain statement of the text: "There were giants in the earth in those days" (Genesis 6:4). On that, the King James translators and the readers of all three views agree. There were giants.
"And also after that"
Genesis 6:4 contains a phrase that shapes the rest of this study: "There were giants in the earth in those days; and also after that" (Genesis 6:4). Moses, writing after the Flood, tells his readers that giants were not only a thing of the world before it.
How did giants come again after a Flood in which "all flesh died that moved upon the earth" (Genesis 7:21), and only eight souls were saved? The Bible does not say. Some suggest the same kind of sin happened again; some that the line came through one of the wives in the ark; some that the giants after the Flood were simply very large peoples with no link to Genesis 6 at all. The text gives no mechanism, and here Moses' own rule applies: "The secret things belong unto the LORD our God: but those things which are revealed belong unto us and to our children for ever, that we may do all the words of this law" (Deuteronomy 29:29). I read "and also after that" as the giants coming back; that too is my conviction, and the text does not tell us how. What it does tell us is where they were and what happened to them. That is the subject of Parts 2 and 3.