Matthew 24:43 in the King James Version
But know this, that if the goodman of the house had known in what watch the thief would come, he would have watched, and would not have suffered his house to be broken up.
Context
42 Watch therefore, for you don’t know in what hour your Lord comes.
43 But know this, that if the master of the house had known in what watch of the night the thief was coming, he would have watched, and would not have allowed his house to be broken into.
44 Therefore also be ready, for in an hour that you don’t expect, the Son of Man will come.