John 20:19-23 New King James Version (NKJV)
The Apostles Commissioned
19 Then, the same day at evening, being the first day of the week, when the doors were shut where the disciples were [a]assembled, for fear of the Jews, Jesus came and stood in the midst, and said to them, “Peace be with you.” 20 When He had said this, He showed them His hands and His side. Then the disciples were glad when they saw the Lord.
21 So Jesus said to them again, “Peace to you! As the Father has sent Me, I also send you.” 22 And when He had said this, He breathed on them, and said to them, “Receive the Holy Spirit. 23 If you forgive the sins of any, they are forgiven them; if you retain the sins of any, they are retained.”
Acts 1:3-5 New King James Version (NKJV)
3 to whom He also presented Himself alive after His suffering by many [a]infallible proofs, being seen by them during forty days and speaking of the things pertaining to the kingdom of God.
The Holy Spirit Promised
4 And being assembled together with them, He commanded them not to depart from Jerusalem, but to wait for the Promise of the Father, “which,” He said, “you have heard from Me; 5 for John truly baptized with water, but you shall be baptized with the Holy Spirit not many days from now.”