2 Peter 2:4 gives the earlier example of fallen angels — both illustrate God's pattern of judgment and preservation in the same argument.

2 Peter 3:6 directly restates the flood—'the world that then existed was deluged with water'—reinforcing the same historical judgment.

1 Peter 3:20 also mentions the eight persons saved through water in Noah's day, linking the flood to baptism.

Genesis 7:1-24 is the source narrative—God commands Noah into the ark and brings the flood, the event Peter summarizes.

Hebrews 11:7 highlights Noah's faith in building the ark and condemning the world, adding the faith element to Peter's portrait of Noah as a herald of righteousness.

Luke 17:27 continues the same typology: the flood destroyed them while Noah entered the ark, reinforcing the sudden judgment.

Luke 17:26 similarly compares the days of Noah to the Son of Man's coming—parallel to Peter's reference to the flood judgment.

Job 22:16 directly refers to the flood that swept away the wicked — the same event Peter uses as an example of divine judgment.

In Matthew 24:37-39, Jesus uses the flood as a type of his coming—sudden judgment on an unaware world, echoing Noah's days.

Psalm 78:50 says God 'did not spare them from death' — a direct verbal parallel to 2 Peter 2:5's 'did not spare the ancient world', reinforcing the pattern of divine judgment.

1 Peter 4:18 quotes that the righteous are scarcely saved while the ungodly perish — directly echoing Noah's salvation and the flood judgment here.

In Matthew 24:40, Jesus uses Noah's flood as a type of sudden judgment, warning of coming separation — echoing the flood judgment here.

Ezekiel 5:11 declares 'my eye will not spare' — a direct phrase echoing 2 Peter 2:5's 'did not spare', linking God's judgment on Israel to the flood judgment.

In Genesis 6:8, Noah found favor with God, directly explaining why God preserved him in the flood.

Genesis 7:23 states everything on earth was destroyed except Noah and those with him, summarizing the flood's outcome.

In Genesis 7:21, all flesh died, confirming the total destruction of the ungodly world Peter describes.

Genesis 7:7 shows Noah and his family entering the ark, the specific act of preservation Peter references.

In Genesis 6:18, God establishes a covenant to preserve Noah, his family, and the animals — the basis for their survival.

Genesis 6:17 records God's decree to bring the flood, matching Peter's 'bringing a flood upon the ungodly'.

In Genesis 6:12, all flesh had corrupted their way, providing the reason for the flood judgment on the ungodly.

Genesis 6:9 describes Noah as righteous and blameless, substantiating Peter's term 'herald of righteousness'.

Romans 8:32 uses the same phrase 'did not spare' but for God's own Son — contrasting judgment with sacrificial love.

In Deuteronomy 29:20, God's refusal to forgive parallels the divine non-sparing of the ancient world in 2 Peter 2:5 — both depict unrelenting judgment on the ungodly.