Did angels really have children with humans? What does the New Testament say?

Yes — and three New Testament letters say so explicitly.

The NT writers do not treat Genesis 6:1-4 as a myth or an allegory about human lineages. They treat it as a historical event involving angelic beings who transgressed their proper boundaries, and they use the imprisonment of those beings as a theological anchor for judgment and the flood narrative.

Jude 1:6 and 1:14-15

Jude writes plainly:

"And the angels who did not keep their own archē (G746, domain/dominion) but abandoned their proper oikētērion (G3613, dwelling) — he has kept in eternal chains under gloom for the judgment of the great day." — Jud 1:6 (TAGNT)

The vocabulary is precise: archē means the domain or station they were assigned to; oikētērion means the dwelling that was their proper place. The angels left it. They are now imprisoned pending judgment. The structure of the sentence matches the Genesis 6 story exactly: heavenly beings who crossed the boundary downward into the human realm and are now held in chains.

Two verses later (Jud 1:8) Jude calls the people he is warning "these dreamers" who "defile flesh" — using the same boundary-crossing logic. He is drawing a line from the imprisoned angels to present-day boundary violations. The transgression of Genesis 6 is his paradigm case.

Then, in Jude 1:14-15, he does something startling: he quotes 1 Enoch by name, calling Enoch "the seventh from Adam" and citing 1 Enoch 1:9 as prophecy. The Greek of Jude 1:14b — idou ēlthen kyrios en hagiais myriasin autou ("behold, the Lord came with his holy myriads") — matches the surviving Aramaic and Greek fragments of 1 Enoch word for word. Jude treats 1 Enoch as prophetic material. He places the Watchers tradition — the 1 Enoch expansion of Genesis 6 — inside his theological argument as settled background.

2 Peter 2:4-5

Peter uses a word that appears nowhere else in the Greek Bible:

"For if God did not spare angels when they sinned, but tartarōsas (G5020 — cast into Tartarus) consigned them to chains of gloom and handed them over for judgment..." — 2 Pet 2:4 (TAGNT)

Tartaroō (ταρταρόω) is the verb form of Tartarus — the deepest pit of the underworld in Greek myth, the place where the gigantes were imprisoned after their defeat by the Olympians (Hesiod, Theogony 717-735). This is not incidental vocabulary. The LXX had already rendered nephilim as γίγαντες, tying Genesis 6:4 to the gigantes framework. Peter uses the technical verb for where the gigantes were imprisoned — and he places it directly before the flood narrative in v.5. The sequence is intentional: angels sinned, angels are imprisoned in Tartarus, then Noah is preserved through the flood. The Genesis 6 angelic-descent story is Peter's setup for the flood.

1 Peter 3:19-20

Peter returns to the same territory in his first letter:

"...in which he also went and proclaimed to the spirits in prison, who formerly did not obey when God's patience waited in the days of Noah, while the ark was being prepared, in which a few — that is, eight souls — were brought safely through water." — 1 Pet 3:19-20 (TAGNT)

"The spirits in prison" (tois en phylakē pneumasin, G4151 in prison) are those who disobeyed "in the days of Noah." The "prison" is the same conceptual location as the chains of Jude 1:6 and the Tartarus of 2 Peter 2:4. Whether Peter means the Watchers specifically, or the disobedient generation of the flood, or both, he is writing inside the same tradition — and the connection between their imprisonment and the flood is explicit.

What this means for reading Genesis 6

The New Testament letters do not invent an angelic reading of Genesis 6. They inherit it. By the time Jude and Peter write, the Watcher tradition (1 Enoch 6-16) has been circulating for two to three centuries. It was the standard Jewish reading of Genesis 6 in the Second Temple period — and it was the only reading available in Greek, because the LXX had already called the offspring of the sons of God gigantes.

The Second Temple expansion is not canon. Genesis 6:1-4 does not give us the names of the Watchers, the location of their descent, or the size of their offspring. 1 Enoch supplies those details; Genesis does not. But when Jude calls the imprisoned angels those "who did not keep their own domain" and when Peter casts them into Tartarus, they are reading the same four Hebrew verses that began the tradition — and they are reading them the way the Hebrew lexicon points.

The full study traces the connection from the Hebrew bene ha-elohim through the LXX γίγαντες to 1 Enoch and into Jude and Peter in The Nephilim: What Genesis 6:1-4 Actually Says.