Levites, verses 3-23
The numbering of the Levites began at age thirty because it was at that age they were eligible to enter into their official duties (Numbers 4:3 and other verses in the chapter). The number came to only thirty-eight thousand, which seems a small number for the time. However, the active years of Levitical service extended only to age fifty, where doubtless the numbering also ended. This enumeration was especially important to those who returned from the Babylonian exile with Zerubbabel, Ezra, and others. At that time they had to establish their lineage to officiate ( see Ezra 2:61-63). This would help to explain why these matters were recorded in the Books of Chronicles, which were composed after the exile, but not in the Books of Kings.
The thirty-eight thousand Levites were divided into four groups A large group numbering twenty-four thousand were devoted strictly to the work of maintaining the house and worship of the Lord. Six thousand were appointed as officers and judges in the towns and tribes where they were scattered. Four thousand more were porters, or temple watchmen, while the remaining four thousand supplied the choristers and instrumentalists for the temple choir and orchestra.
The families of the Levites were arranged in courses according to their patronage, stemming from the three sons of Levi. These were Gershon, Kohath, and Merari. Verses 7-11 enumerate the sons and descendants of Gershon (sometimes Gershom). None of these are particularly prominent otherwise. It is interesting to note, from verse 11 that small families were included with larger ones.
The Kohathites were the largest family. The priestly family of Aaron came from the Kohathites, but most of the Kohathites were merely Levites, not priests. Verses 12-20 enumerate the heads of this important family. Amram was the father of Moses and Aaron. Though Moses was the great leader of Israel, the family of Aaron succeeded to greater prestige in later generations, and the sons and descendants of Moses were mere Levites. This is specifically indicated by verses 15-17, where the descendants of Moses’ two sons are listed. Eliezer (the younger son) fathered a large family known as the sons of Rehabiah.
The families of the Merarites numbered only two, but in their times were about as numerous as some of the others. Very little is noted of them in this context. It is noted that one of the more prominent descendants died without sons. His daughters married their cousins and maintained their father’s lineage within the tribe of Levi (seethe law relative to this situation, Numbers, chapter 36).