John Gill Commentary Acts 2:31

"he foreseeing [this] spake of the resurrection of the Christ, that neither was he left unto Hades, nor did his flesh see corruption." — Acts 2:31 (ASV)

He seeing this before
Or by a spirit of prophecy foreseeing it, that according to God's promise and oath, the Messiah would be raised up, and spring from his seed; and also by the same Spirit foresaw that he would suffer and die, and be laid in the grave, the pit of corruption:

spoke of the resurrection of Christ ;
from the dead, to the sense of the following words, in (Psalms 16:10) .

that his soul was not left in hell :
neither his separate soul in Hades, nor his body in the grave;

neither his flesh did see corruption ;
or his body, or his "carcass", as the Syriac version renders it, did not lie so long in the grave as to rot and putrefy.