He who can be “The person who” or “Anyone who,” “Whoever,” or similar.

Receives (so also New English Bible) may be better translated “welcomes” (Good News Translation, New Jerusalem Bible, New American Bible, Phillips, Barclay); the verb was previously used in verse 14. Elsewhere in the New Testament it also has the meaning “receive in a hospitable manner” or “welcome as a guest.” See Mark 6.11; Luke 9.5, 53; 10.8, 10; John 4.45; Colossians 4.10; Hebrews 11.31.

Him who sent me is a reference to God, and so it may be translated “God who sent me” or “the Father who sent me.”

Quoted with permission from Newman, Barclay M. and Stine, Philip C. A Handbook on the Gospel of Matthew. (UBS Handbook Series). New York: UBS, 1988. For this and other handbooks for translators see here .