Numbers 4:28

4:28 This is the service of the families of the Gershonites concerning the tent of meeting. Their responsibilities will be under the authority ¹  of Ithamar son of Aaron the priest. ² 

Numbers 4:33

4:33 This is the service of the families of the Merarites, their entire service concerning the tent of meeting, under the authority of Ithamar son of Aaron the priest.”

[4:28]  ¹ tn Or “the direction” (NASB, TEV); Heb “under/by the hand of.” The word “hand” is often used idiomatically for “power” or “authority.” So also in vv. 33, 37, 45, 48.

[4:28]  ² sn The material here suggests that Eleazar had heavier responsibilities than Ithamar, Aaron’s fourth and youngest son. It is the first indication that the Zadokite Levites would take precedence over the Ithamar Levites (see 1 Chr 24:3-6).