Irenaeus Against Heresies Book IV "Watch ye therefore, for ye know not in what day your Lord shall come."[568]

Irenaeus Against Heresies Book V

and for this cause did the Lord command His disciples to be on the watch.[68]

Clement of Alexandria Stromata Book V

For He not only figuratively calls the resurrection of Christ rising from sleep; but to the descent of the Lord into the flesh he also applies the figurative term sleep. The Saviour Himself enjoins, "Watch; "[187]

Didache

but be ye ready, for ye know not the hour in which our Lord cometh.[138]

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Old Testament