2 Peter 3:6

An Understandable Version (2005 edition)

[And] it was by water that the world, which existed at that time, perished in a great flood [of Noah’s day]!

Cross References

2 Peter 2:5

and if He did not spare the ancient world of Noah’s day, when He brought a flood on those ungodly people (though Noah, a preacher of righteousness, and seven other people, were saved from it);

Luke 17:27

People were eating and drinking and [men were] marrying and [women] were being given away in marriage [right up] until the day that Noah entered the ship and the Flood came and drowned them all.