Expositor's Bible Commentary Commentary 2 Peter 2:5

"and spared not the ancient world, but preserved Noah with seven others, a preacher of righteousness, when he brought a flood upon the world of the ungodly;" — 2 Peter 2:5 (ASV)

Peter’s second example is the Flood. He has referred to this in his first letter (1 Peter 3:18–22) and will do so again in the next chapter of this one (3:6). With Noah seven others were saved (his wife, his three sons, and his three daughtersin-law). They were guarded or protected by God during the Flood that wiped out the ungodly pre-Flood civilization. Noah was a “preacher [GK 3061] of righteousness.” This could refer to his preaching activity not recorded in the OT or to the fact that his lifestyle condemned sin and proclaimed righteousness to his contemporaries (Genesis 6:9).