Psalm 110:4

New Catholic Bible

⁴The Lord has sworn,
and he will not retract his oath:
“You are a priest forever^[a]
according to the order of Melchizedek.”

Psalm 110:4 The prophet-psalmist pronounces a second divine oracle, guaranteed by an oath. The Lord makes his king his chief priest for life, according to the order and image of Melchizedek. There are three main points of resemblance between Melchizedek and Christ. Both are kings as well as priests, both offer bread and wine to God, and both have their priesthood directly from God (see Gen 14:18; Heb 7). For a prophetic vision of the glorious union of the Messiah-Priest, see Zec 6:13; for the New Testament application, see Heb 5:6-10; 7:22. Forever: perhaps alluded to in Jn 12:34.

New Catholic Bible (NCB)