GOD'S WORD® Translation
They were not aware of what was happening until the flood came and swept all of them away. That is how it will be when the Son of Man comes again.

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

Berean Study Bible
And they were oblivious, until the flood came and swept them all away. So will it be at the coming of the Son of Man.

Douay-Rheims Bible
And they knew not till the flood came, and took them all away; so also shall the coming of the Son of man be.

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

King James Bible
And knew not until the flood came, and took them all away; so shall also the coming of the Son of man be.

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

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

Matthew 24:39 Additional Translations ...