The first is from Peter’s evangelistic sermon in Acts 2:22-36:
[Y]ou nailed [Jesus] to the cross by the hands of godless men and put Him to death. But God raised Him up again, putting an end to the agony of death, since it was impossible for Him to be held in its power. For David says of Him, “…You will not abandon my soul to Hades, nor allow Your Holy One to undergo decay.”
In case they missed the fact that Jesus’ body did not decay, Peter continues:
Brethren, I may confidently say to you regarding the patriarch David that he both died and was buried, and his tomb is with us to this day. And so, because he was a prophet…, he looked ahead and spoke of the resurrection of the Christ, that He was neither abandoned to Hades, nor did His flesh suffer decay. This Jesus God raised up again, to which we are all witnesses.