New International Version
"Therefore keep watch, because you do not know on what day your Lord will come.

American Standard Version
Watch therefore: for ye know not on what day your Lord cometh.

Berean Study Bible
Therefore keep watch, because you do not know the day on which your Lord will come.

Douay-Rheims Bible
Watch ye therefore, because ye know not what hour your Lord will come.

English Revised Version
Watch therefore: for ye know not on what day your Lord cometh.

King James Bible
Watch therefore: for ye know not what hour your Lord doth come.

World English Bible
Watch therefore, for you don't know in what hour your Lord comes.

Young's Literal Translation
'Watch ye therefore, because ye have not known in what hour your Lord doth come;

Matthew 24:42 Additional Translations ...