Mark 13:34-36 NIV

34 It's like a man going away: He leaves his house and puts his servants1 in charge, each with his assigned task, and tells the one at the door to keep watch.

References for Mark 13:34

35 "Therefore keep watch because you do not know when the owner of the house will come back--whether in the evening, or at midnight, or when the rooster crows, or at dawn.
36 If he comes suddenly, do not let him find you sleeping.