Numbers 18:1-2

Darby Translation

18 And Jehovah said to Aaron, Thou and thy sons and thy father's house with thee shall bear the iniquity of the sanctuary; and thou and thy sons with thee shall bear the iniquity of your priesthood.

² And thy brethren also, the tribe of Levi, the tribe of thy father, bring near with thee, that they may unite with thee, and minister unto thee; but thou and thy sons with thee [shall serve] before the tent of the testimony.