Matthew 24:39

And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be.
— Matthew 24:39, King James Version

In other translations

World English Bible (WEB)

and they didn't know until the flood came, and took them all away, so will be the coming of the Son of Man.

American Standard Version (ASV)

and they knew not until the flood came, and took them all away; so shall be the coming of the Son of man.

Young's Literal Translation (YLT)

and they did not know till the flood came and took all away; so shall be also the presence of the Son of Man.