Where is "and what I say to you, I say to all, Watch.'" found in the Bible?

This verse is found in Mark, chapter 13, verse 37 of the Young's Literal Translation (YLT) Bible translation.

Mark 13:37 (YLT) - Bible Verse

and what I say to you, I say to all, Watch.'

And Moses said, I will turn aside now, and see this great sight, why the bush is not burnt.