No messenger is greater than the one who sent him

"Amen, amen, I say to you, whoever receives the one I send
receives me, and whoever receives me receives the one who sent me."

-- Jn 13:16-20

Jesus is the Father's Emissary. From the beginning of his ministry, he "called to him those whom he desired; . . . . And he appointed twelve, whom also he named apostles, to be with him, and to be sent out to preach." From then on, they would also be his "emissaries" (Greek apostoloi). In them, Christ continues his own mission: "As the Father has sent me, even so I send you." The apostles' ministry is the continuation of his mission; Jesus said to the Twelve: "he who receives you receives me."

-- CCC 858