Every part of the Mass echoes scripture from start to
finish. In the communion rite the Priest
says:
Lord Jesus Christ, who said to your Apostles: Peace I leave you, my peace I give you…
This comes from John
14:27:
Peace I leave with you; my peace I give to you. I do not give to you as the world gives. Do not let your hearts be troubled, and do not let them be afraid.

