Acts 2:33

Being therefore by the right hand of God exalted, and having received of the Father the promise of the Holy Spirit, he hath poured forth this which ye see and hear.

By the right hand of God ... Christ had indeed appeared alive after his death and burial, and the apostles had seen him ascend into heaven. As so often affirmed in Scripture, Jesus was exalted at the right hand of the Majesty on High, and that exaltation was the fulfillment of God's oath that a descendant of David would sit upon his throne in perpetuity.

He hath poured forth this ... Despite the fact of his being in heaven, Jesus was still concerned with earth and the men dwelling upon it. He had promised the apostles that "another Comforter" would be given unto them; and here Peter affirmed that the baptism of the apostles in the Holy Spirit, as audibly and visually evidenced by the miraculous demonstration somewhat earlier, had indeed come to pass as Jesus promised. "Christ's present impartation of the Spirit to the apostles, attended as it was by sensible signs, was a further open vindication of the claim that he was the exalted Messiah."[36] However, before leaving the subject, Peter would offer another proof.