Matthew 24:42-44
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42Watch therefore: for ye know not on what day your Lord cometh. 43But know this, that if the master of the house had known in what watch the thief was coming, he would have watched, and would not have suffered his house to be broken through. 44Therefore be ye also ready; for in an hour that ye think not the Son of man cometh.
Matthew 24:42-44 (ASV)