Numbers 3:39

36 And in their care are to be all the boards of the Tent, with their rods and pillars and bases, and all the instruments, and all they are used for,

37 And the pillars of the open space round it, with their bases and nails and cords.

38 And those whose tents are to be placed on the east side of the House in front of the Tent of meeting, looking to the dawn, are Moses and Aaron and his sons, who will do the work of the holy place for the children of Israel; and any strange person who comes near will be put to death.

39 All the Levites numbered by Moses and Aaron at the order of the Lord, all the males of one month old and over numbered in the order of their families, were twenty-two thousand.

40 And the Lord said to Moses, Let all the first male children be numbered, and take the number of their names.

41 And give to me the Levites (I am the Lord) in place of the first sons of the children of Israel; and the cattle of the Levites in place of the first births among the cattle of the children of Israel.

42 So Moses had all the first sons among the children of Israel numbered, as the Lord said to him.