Catena Fidei

Acts 1:10 (WEB)
While they were looking steadfastly into the sky as he went, behold, two men stood by them in white clothing,

Catechism · 1

§333Paragraph 5 · Heaven and EarthRead at vatican.va
“They will be present at Christ's return, which they will announce, to serve at his judgement.” — Catechism footnote: Cf. Acts 1:10-11; Mt 13:41; 24:31; Lk 12:8-9. the angels in the life of the Church

Jerome, Letters Letter 108
“I will return to Jerusalem and, passing through Tekoa the home of Amos, I will look upon the glistening cross of Mount Olivet from which the Saviour made His ascension to the Father.” — editor's note: Luke xxiv. 50, 51; Acts i. 9–12.
Read the whole comment

Tertullian, On Baptism Chapter 18
“…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.” — editor's note: Comp. Acts i. 10 and Luke ix. 30: in each place St. Luke says, ἄνδρες δύο: as also in xxiv. 4 of his Gospel.
Read the whole comment
Tertullian, On the Resurrection of the Flesh Chapter 51
“…and blood, yet purer than ours—who “shall descend in like manner as He ascended into heaven” the same both in substance and form, as the angels affirmed, so as even to be recognised by those who pierced Him.” — editor's note: Ver. 10.
Read the whole comment

Augustine of Hippo, Tractates on the Gospel of John Tractate 21
“This same that is taken up from you into heaven, shall so come in like manner as ye have seen Him going into heaven.”” — editor's note: Acts i. 3–11.
Read the whole comment
Augustine of Hippo, Tractates on the Gospel of John Tractate 50
“Because in respect of His bodily presence He associated for forty days with His disciples, and then, having brought them forth for the purpose of beholding and not of following Him, He ascended into heaven, and is no longer here.” — editor's note: Acts i. 3, 9, 10.
Read the whole comment
Augustine of Hippo, Tractates on the Gospel of John Tractate 94
“For a cloud received Him when He ascended up from their side; and of His going into heaven they made no verbal inquiry, but had ocular evidence.” — editor's note: Acts i. 9–11.
Read the whole comment