Watch therefore: for ye know not when the lord of the house cometh, whether at even, or at midnight, or at cockcrowing, or in the morning;

So you are to keep watch: because you are not certain when the master of the house is coming, in the evening, or in the middle of the night, or at the cock's cry, or in the morning;

Αγρυπνειτε λοιπον· διοτι δεν εξευρετε ποτε ερχεται ο κυριος της οικιας, την εσπεραν η το μεσονυκτιον η οταν φωναζη ο αλεκτωρ η το πρωι·

Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning: