Matthew 24:39-44

and they knew not until the flood came, and took them all away; so shall be the coming of the Son of man. Then shall two men be in the field; one is taken, and one is left: two women shall be grinding at the mill; one is taken, and one is left. Watch therefore: for ye know not on what day your Lord cometh. But 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. Therefore be ye also ready; for in an hour that ye think not the Son of man cometh.