Numbers 26:21
And these were the descendants of Perez:
What it says
The descendants of Perez are named as part of Judah’s line.
What it is doing
It specifies a major branch within Judah.
In context
19The sons of Judah were Er and Onan, but they died in the land of Canaan. 20These were the descendants of Judah by their clans: 21And these were the descendants of Perez: 22These were the clans of Judah, and their registration numbered... 76,500.