New Revised Standard Version
Those who were to camp in front of the tabernacle on the east—in front of the tent of meeting toward the east—were Moses and Aaron and Aaron’s sons, having charge of the rites within the sanctuary, whatever had to be done for the Israelites; and any outsider who came near was to be put to death.

Contemporary English Version
Moses, Aaron, and his sons were to camp in front of the sacred tent, on the east side, and to make sure that the Israelites worshiped in the proper way. Anyone else who tried to do the work of Moses and Aaron was to be put to death.

New American Bible
East of the tabernacle, that is, in front of the tent of meeting, toward the sunrise, were camped Moses and Aaron and the latter’s sons, performing the duties of the sanctuary incumbent upon the Israelites. Any unauthorized person who came near was to be put to death.

Douay-Rheims Bible
Before the tabernacle of the covenant, that is to say on the east side shall Moses and Aaron camp, with their sons, having the custody of the sanctuary, in the midst of the children of Israel. What stranger soever cometh unto it, shall be put to death.

Before the tabernacle of the covenant, that is to say on the east side shall Moses and Aaron camp, with their sons, having the custody of the sanctuary, in the midst of the children of Israel. What stranger soever cometh unto it, shall be put to death.

toward

Numbers 3:23,29,35 These shall pitch behind the tabernacle on the west, . . .

Numbers 1:53 But the Levites shall pitch their tents round about the tabernacle, lest there come indignation upon the multitude of the children of Israel, and they shall keep watch, and guard the tabernacle of the testimony.

Numbers 2:3 On the east Juda shall pitch his tents by the bands of his army: and the prince of his sons; shall be Nahasson the son of Aminadab.

keeping

Numbers 1:10 And of the sons of Joseph: of Ephraim, Elisama the son of Ammiud: of Manasses, Gamaliel the son of Phadassur.

Numbers 18:1-5 And the Lord said to Aaron: Thou, and thy sons, and thy father's house with thee shall bear the iniquity of the sanctuary: and thou and thy sons with thee shall bear the sins of your priesthood. . . .

1 Chronicles 6:48,49 Their brethren also the Levites, who were appointed for all the ministry of the tabernacle of the house of the Lord. . . .

for the charge

Numbers 3:7,8,10 And observe whatsoever appertaineth to the service of the multitude before the tabernacle of the testimony, . . .