I Chronicles 23:12-14

The sons of Kohath: Amram, Izhar, Hebron, and Uzziel—four in all. The sons of Amram: Aaron and Moses; and Aaron was set apart, he and his sons forever, that he should sanctify the most holy things, to burn incense before the LORD, to minister to Him, and to give the blessing in His name forever. Now the sons of Moses the man of God were reckoned to the tribe of Levi.