Numbers 7:8

5 `Receive from them, and they have been to do the service of the tent of meeting, and thou hast given them unto the Levites, each according to his service.`

6 And Moses taketh the waggons and the oxen, and giveth them unto the Levites.

7 The two of the waggons and the four of the oxen he hath given to the sons of Gershon, according to their service,

8 and the four of the waggons and the eight of the oxen he hath given to the sons of Merari, according to their service, by the hand of Ithamar son of Aaron the priest;

9 and to the sons of Kohath he hath not given, for the service of the sanctuary [is] on them: on the shoulder they bear.

10 And the princes bring near the dedication of the altar in the day of its being anointed; yea, the princes bring near their offering before the altar.

11 And Jehovah saith unto Moses, `One prince a day -- one prince a day -- do they bring near their offering for the dedication of the altar.`