en_tn/1ki/12/21.md

all the house of Judah and the tribe of Benjamin

Here "house" is a metonym that represents a tribe or descendants. And, here "tribe" refers specifically to the soldiers from those tribes. Alternate translation: "all the soldiers from the tribes of Judah and Benjamin" (See: rc://en/ta/man/jit/figs-metonymy)

180,000 chosen men

"one hundred eighty thousand chosen men" (See: rc://en/ta/man/jit/translate-numbers)

the house of Israel

Here "house" represents the kingdom made up of the 10 northern tribes of Israel. Alternate translation: "the kingdom of Israel" or "the people of the northern tribes of Israel" (See: rc://en/ta/man/jit/figs-metonymy)