Salmos 110:4

After the order of Melchizedek. — This follows the LXX. and Vulg. Better, after the manner of since there could have been with the psalmist no intention of contrasting this priesthood with that of Aaron, as there naturally was when the Aaronic order had come to an end or was visibly doomed to extinction.

The previous history of Israel itself offered no example of the formal union of kingly and priestly offices in one person. It first appears in idea in Zacarias 6:12; in actual fact in the pontificate of Jonathan (1Ma. 10:21). It is true that the royal and priestly functions were sometimes united, especially in the case of David, and in 2 Samuel 8:18, David’s sons are called “priests” (in English version, “chief rulers;” margin, or princes). It was therefore necessary to go back to Melchizedek, in whom history recognised this sanctioned and formal union (Gênesis 14:18). For the various points brought out in the Epistle to the Hebreus 6:7, see New Testament Commentary.