en_tn/2ch/30/01.md

all Israel and Judah

This represents the nation of Israel in general. Earlier the nation had been split into two kingdoms called by these names.

Ephraim and Manasseh

Ephraim and Manasseh were two of the tribes in the northern part of Israel. Here the phrase "Ephraim and Manasseh" refers to the people who belonged to all ten of the northern tribes of Israel. AT: "the northern tribes of Israel" (See: rc://en/ta/man/translate/figs-synecdoche)