Numbers 4:3 sets the Levite service age at 30, contrasting with the 25-year minimum here.

Numbers 4:23 repeats the 30-year age for Levite service, differing from the 25-year start here.

Numbers 1:53 describes Levites guarding the tabernacle—directly related to their service role introduced here. Same context and tribe.

Numbers 3:7 also details Levites keeping guard at the tent of meeting—parallel duty from the same Pentateuchal setting.

Numbers 4:35 sets the service age for Kohathites at 30–50, contrasting with the 25+ here. Different age for the same tribal duty.

1 Chronicles 23:3 lists Levites from 30 and up, a different age threshold than the 25 here.

1 Chronicles 23:24 lowers the Levite service age to 20, showing a shift from the 25-year rule here.

2 Chronicles 31:17 records Levites serving from age 20—a different age from the 25 here, showing later practice variation.