Numbers 18:6-8
Wycliffe Bible
6 Lo! I have given to you your brethren, the deacons, from the midst of the sons of Israel, and I have given you them (as) a free gift to the Lord, that they serve in the services of the tabernacle. (Lo! I have given you your brothers, the Levites, from among the Israelites, and I have given them to you as a free gift for the Lord, in their service to the Tabernacle.)
7 Soothly thou and thy sons, keep your priesthood; and all things that pertain to the adorning of the altar, and be within the veil, shall be ministered by [the] priests; if any stranger nigheth thereto, he shall be slain. (Thou and thy sons, do your priestly duties; and all the things in the service of the altar, and that be within the Veil, shall be the priests’ responsibility; if any stranger nigheth thereto, he shall be put to death.)
8 The Lord spake to Aaron, Lo! I have given to thee the keeping of my first fruits; I have given to thee, and to thy sons, all things that be hallowed of the sons of Israel, for [the] priest’s office (to be) everlasting lawful things. (And the Lord spoke to Aaron, and said, Lo! I give thee the special contributions given to me, for thy own use; I give thee, and thy sons, all the things that be hallowed by the Israelites, by an everlasting law, for the office, or the use, of the priest.)
Read full chapter2001 by Terence P. Noble