Zechariah 6:13 (WEB)
He will build the LORD’s temple. He will bear the glory, and will sit and rule on his throne. He will be a priest on his throne. The counsel of peace will be between them both.
Catechism · 1
“It was necessary that the Messiah be anointed by the Spirit of the Lord at once as king and priest, and also as prophet.” — Catechism footnote: Cf. Is 11:2; 61:1; Zech 4:14; 6:13; Lk 4:16-21.