Mark 13:33 in the King James Version
Take ye heed, watch and pray: for ye know not when the time is.
Context
32 “But of that day or that hour no one knows—not even the angels in heaven, nor the Son, but only the Father.
33 Watch, keep alert, and pray; for you don’t know when the time is.
34 “It is like a man traveling to another country, having left his house and given authority to his servants, and to each one his work, and also commanded the doorkeeper to keep watch.