4:2ff The Kohathites, Gershonites (4:21), and Merarites (4:29) were families of Levites who were assigned special tasks in Israel’s worship. For the jobs described in this chapter, a Levite had to be between 30 and 50 years old. He was expected to carry out his duties as described here in every detail. In fact, failure to do so would mean death (4:20). This contrasted greatly from the religious practices of the Egyptians who could purchase amulets and potions. Their idols could be handled. The God of the Hebrews was not to be handled or reduced to common elements. He is greater than anything in his creation. Worshiping our holy God must not be taken lightly.
4:27, 28 The Gershonites could receive directions from any of Aaron’s sons, but they were directly responsible to Ithamar only. The lines of authority and accountability were clearly communicated to all. As you function with others in service to God, make sure the lines of authority between you and those you work with are clearly understood. Good communication builds good relationships.