Numbers 1:47-50

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

⁴⁸seeing 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;

⁵⁰and 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.