Luke 12:39 in the World English Bible
But know this, that if the master of the house had known in what hour the thief was coming, he would have watched and not allowed his house to be broken into.
Context
38 And if he shall come in the second watch, or come in the third watch, and find them so, blessed are those servants.
39 And this know, that if the goodman of the house had known what hour the thief would come, he would have watched, and not have suffered his house to be broken through.
40 Be ye therefore ready also: for the Son of man cometh at an hour when ye think not.