Numbers 4:23
From thirty years old and upward until fifty years old shalt thou number them; all that enter in to perform the service, to do the work in the tabernacle of the congregation.
Cross-reference
Numbers 4:3 applies the same age range (30-50) to Kohathites — the same standard used here for Gershonites.
Numbers 4:30 repeats the same age requirement for the Merarites, showing the identical rule applied to another Levite clan.
Numbers 4:35 records the same age range for Kohathites, confirming the uniform census criteria for all Levite clans.
Numbers 4:47 sums up the total Levites aged 30 to 50, applying the same age standard to the whole tribe.
Numbers 8:24 lowers the starting age to 25, contrasting with the 30‑year minimum here for tabernacle service.
Numbers 8:25 specifies cessation at age 50, matching the upper limit given here for Levitical service.
1 Chronicles 23:3 later uses the same 30‑year threshold for counting Levites under David, showing continuity of the rule.