John 20 : 19-23

On the evening of that day, the first day after the Sabbath, the doors were locked where the disciples were, because of their fear of the Jews. But Jesus came, and stood among them, and said to them, “Peace be with you!” Then He showed them His hands and His side. The disciples kept looking at the Lord and were full of joy.

Again Jesus said to them, “Peace be with you! As the Father has sent Me, so I send you.” After saying this, He breathed on them, and said to them, “Receive the Holy Spirit! Those whose sins you forgive, they are forgiven; those whose sins you retain, they are retained.”

Alternative reading

John 14 : 15-16, 23b-26

If you love Me, you will keep My commandments; and I will ask the Father, and He will give you another Helper to be with you forever. If anyone loves Me, he will keep My word and My Father will love him; and We will come to him and make a room in his home.

But if anyone does not love Me; he will not keep My words; and these words that you hear are not Mine, but the Father’s who sent Me. I told you all this while I was still with you. From now on the Helper, the Holy Spirit whom the Father will send in My Name, will teach you all things, and remind you of all that I have told you.