Chronicles I ch.23 - Who is Rechavia?

In Chapter 23 David takes a census of the Levites and assigns them to one of four divisions:

1. Management and supervision of the Construction of the Temple

2. Shoftim and Shotrim - Law (and order)

3. Gatekeepers

4. Song and music

We also read about Moshe's sons and grabdchildren for the first time in Tanakh! And this is where we meet Rechavia