And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God.

Wesley's Notes

7:56 I see the Son of man standing - As if it were just ready to receive him. Otherwise he is said to sit at the right hand of God.

Jamieson-Fausset-Brown Bible Commentary

56. I see . the Son of man standing, &c.-This is the only time that our Lord is by human lips called THE Son of Man after His ascension (Re 1:13; 14:14 are not instances). And why here? Stephen, full of the Holy Ghost, speaking now not of himself at all (Ac 7:55), but entirely by the Spirit, is led to repeat the very words in which Jesus Himself, before this same council, had foretold His glorification (Mt 26:64), assuring them that that exaltation of the Son of Man which they should hereafter witness to their dismay, was already begun and actual [Alford].

Matthew Henry's Concise Commentary

7:54-60 Nothing is so comfortable to dying saints, or so encouraging to suffering saints, as to see Jesus at the right hand of God: blessed be God, by faith we may see him there. Stephen offered up two short prayers in his dying moments. Our Lord Jesus is God, to whom we are to seek, and in whom we are to trust and comfort ourselves, living and dying. And if this has been our care while we live, it will be our comfort when we die. Here is a prayer for his persecutors. Though the sin was very great, yet if they would lay it to their hearts, God would not lay it to their charge. Stephen died as much in a hurry as ever any man did, yet, when he died, the words used are, he fell asleep; he applied himself to his dying work with as much composure as if he had been going to sleep. He shall awake again in the morning of the resurrection, to be received into the presence of the Lord, where is fulness of joy, and to share the pleasures that are at his right hand, for evermore.