Peace be unto you; the repeating of this salutation speaketh it more than an ordinary compliment, or form of salutation. It signifieth his reconciliation to them, notwithstanding their error in forsaking him, and fleeing; it prepared their attention for the great things that he was now about to speak to them; it also signified, that he was about to preach the gospel of peace to all nations. As my Father hath sent me, even so send I you; I have now fulfilled my ministry, and am now going to my Father who sent me: now by the same authority that I am sent, I send you, to gather, instruct, and govern my church; I send, or I will send, you clothed with the same authority with which I am clothed, and for the same ends in part for which I was sent.
Related Commentaries of John 20:21
John 20:21
21 Then said Jesus to them again, Peace be unto you: as my Father hath sent me, even so send I you.