Matthew 24 39
They didn't realize what was going to happen until the flood came and swept them all away. That's how the coming of the Son of man will be.
Compare with other 3 random translations
ERV Matthew 24:39They knew nothing about what was happening until the flood came and destroyed them all. “It will be the same when the Son of Man comes.
AMP Matthew 24:39And they did not know or understand until the flood came and swept them all away–so will be the coming of the Son of Man. [Gen. 6:5-8; 7:6-24.]
KJV Matthew 24:39and knew not until the flood came, and took them all away; so shall also the coming of the Son of man be.