Numbers 1:50

47 And the Levites, for the tribe of their fathers, have not numbered themselves in their midst,

48 seeing Jehovah speaketh unto Moses, saying,

49 `Only, the tribe of Levi thou dost not number, and their sum thou dost not take up in the midst of the sons of Israel;

50 and thou, appoint the Levites over the tabernacle of the testimony, and over all its vessels, and over all that it hath; they bear the tabernacle, and all its vessels, and they serve it; and round about the tabernacle they encamp.

51 `And in the journeying of the tabernacle, the Levites take it down, and in the encamping of the tabernacle, the Levites raise it up; and the stranger who is coming near is put to death.`

52 And the sons of Israel have encamped, each by his camp, and each by his standard, by their hosts;

53 and the Levites encamp round about the tabernacle of the testimony; and there is no wrath on the company of the sons of Israel, and the Levites have kept the charge of the tabernacle of the testimony.