Numbers 18:4
And they shall be joined unto thee, and keep the charge of the tabernacle of the congregation, for all the service of the tabernacle: and a stranger shall not come nigh unto you.
Cross-reference
Numbers 18:2 commands bringing fellow Levites to assist — the same joining and guarding role described here.
Numbers 18:7 restricts priestly service to Aaron and sons — contrasting with the Levites' auxiliary guard duty here.
Numbers 1:51 gives the same command: any outsider who approaches the tabernacle must be put to death, reinforcing the boundary.
Numbers 3:10 repeats the identical warning: any outsider who comes near the priesthood shall be put to death.
Numbers 16:40 recalls the Korah incident as a reminder that no outsider may approach to burn incense, reinforcing the same boundary.
Numbers 17:13 voices the fearful realization that anyone approaching the tabernacle dies, directly echoing the consequence of the outsider rule.
2 Samuel 6:7 records God striking Uzzah dead for his error, directly demonstrating the penalty for violating the outsider restriction.
Ezekiel 44:14 appoints Levites to guard the temple and do its work — a parallel restoration of the same duties.
1 Samuel 6:19 shows the deadly consequence when men of Beth-shemesh unlawfully looked at the ark, illustrating the outsider principle.
2 Samuel 6:6 describes Uzzah touching the ark, an unauthorized act that parallels the prohibition against outsiders approaching holy things.
2 Kings 16:12 shows King Ahaz offering sacrifices himself — a violation of the exclusive priestly access commanded here.
Isaiah 56:3 promises inclusion for foreigners who follow God — contrasting with the strict exclusion of outsiders from the sanctuary here.
Exodus 29:33 states that no outsider may eat the holy consecration offerings, extending the same prohibition to sacred food.