Irenaeus

As Jeremiah declares, "The holy Lord remembered His dead Israel, who slept in the land of sepulture; and He descended to them to make known to them His salvation, that they might be saved." For this reason also were the eyes of the disciples weighed down when Christ's passion was approaching; and when, in the first instance, the Lord found them sleeping, He let it pass — thus indicating the patience of God in regard to the state of slumber in which men lay; but coming the second time, He aroused them, and made them stand up, in token that His passion is the arousing of His sleeping disciples, on whose account "He also descended into the lower parts of the earth," to behold with His eyes the state of those who were resting from their labours, in reference to whom He did also declare to the disciples: "Many prophets and righteous men have desired to see and hear what ye do see and hear."

For it was not merely for those who believed on Him in the time of Tiberius Caesar that Christ came, nor did the Father exercise His providence for the men only who are now alive, but for all men altogether, who from the beginning, according to their capacity, in their generation have both feared and loved God, and practised justice and piety towards their neighbours, and have earnestly desired to see Christ, and to hear His voice. Wherefore He shall, at His second coming, first rouse from their sleep all persons of this description, and shall raise them up, as well as the rest who shall be judged, and give them a place in His kingdom.