Of the Gershonites: Ladan and Shimei.
Each Levitical group was to serve in the temple two weeks each year. (This accounted for forty-eight weeks. The remaining four weeks would be taken up with the festivals of Passover, Pentecost and Tabernacles, when all the men of Israel were to assemble at the central place of worship. On these occasions all Levites would be on duty; see Exodus 23:14-17.) The work of the Levites included assisting the priests, keeping the temple clean, providing the music and singing for worship, and attending to the many practical matters connected with the sacrifices and ceremonies (24-32).