KJV: Watch therefore, for ye know neither the day nor the hour wherein the Son of man cometh.

NIV: Therefore keep watch, because you do not know the day or the hour.

ESV: Watch therefore, for you know neither the day nor the hour.

CSB: Therefore be alert, because you don’t know either the day or the hour.

Internal evidence

The verse was harmonized with Matthew 24:44.

NIV: So you also must be ready, because the Son of Man will come at an hour when you do not expect him.

UBS gives the omission of the words an A rating.