Zechariah 6:13

Indeed He (emphatic in the Hebrew text) would build the Lord’s temple. The Lord repeated this assurance for emphasis. The Branch would bear the honor of royal majesty (cf. Daniel 11:21; 1 Chronicles 29:25), sit enthroned-Israel’s priests never sat while ministering-and rule on David’s throne (cf. 2 Samuel 7:16; Isaiah 9:7; Luke 1:32). He would be a priest ruling as a king, and peace (Heb. shalom) would mark his dual offices.

Along with Psalms 110, this verse is one of the clearest statements in the Old Testament that the coming Davidic king would also be a priest (cf. Hebrews 5:1-10; Hebrews 7:1-25). Chisholm favored the view that Zechariah’s audience would have understood that "the Davidic ruler, though not a priest as such, will enjoy the full support of the priesthood." [Note: Chisholm, "A Theology . . .," p. 425.]