1 Chronicles 23:13

The sons of Amram; Aaron and Moses: and Aaron was separated, that he should sanctify the most holy things, he and his sons for ever, to burn incense before the LORD, to minister unto him, and to bless in his name for ever.

Aaron was separated, that he should sanctify the most holy things - i:e., according to Hitzig Wieseler, and others, to the altar of burnt offering (Exodus 29:37) х lªhaqdiyshow (H6942) qodesh (H6944) qaadaashiym (H6944), to sanctify him as a most holy person]. This we believe to be the true meaning. Aaron could not sanctify the vessels and furniture of the sanctuary, which, having been already dedicated to God, were already sanctified as far as they could be: neither can the word here denote 'the holy of holies,' 'the most holy place;' for it is difficult to perceive how Aaron should sanctify the innermost crypt and not the whole sacred edifice which (Numbers 18:10) is called "the most holy place." Besides, these words, when they signify the holy of holies, have always the article prefixed (see this subject fully discussed, Hengstenberg, 'Christology,' 3:, pp. 120-123).

He and his sons for ever - himself and his oldest sons as the high priests in succession, as well as all his male descendants as the priests; for the works which, it specified, they were to do-namely, to burn incense (2 Chronicles 29:11; Luke 1:9), and to minister in the temple, and to invoke the blessing of God on the people (Num. 6:32; Deuteronomy 10:8) -were common to all the priests.