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]