Tertullian, on Acts 1:10

“And while they were beholding him going up to heaven, behold two men stood by them in white garments.”

“After that, Pentecost is a most joyous space for conferring baptisms; wherein, too, the resurrection of the Lord was repeatedly proved among the disciples, and the hope of the advent of the Lord indirectly pointed to, in that, at that time, when He had been received back into the heavens, the angels told the apostles that "He would so come, as He had withal ascended into the heavens; " at Pentecost, of course.”

Imported from an open dataset — not yet checked against the printed edition.