Numbers 18:2

CKJV_Strongs(i)
  2 H251 And your brothers H4294 also of the tribe H3878 of Levi, H7626 the tribe H1 of your father, H7126 bring H3867 you with you, that they may be joined H8334 unto you, and minister H1121 unto you: but you and your sons H6440 with you shall minister before H168 the tabernacle H5715 of witness.