en_tn/num/21/23.md

to pass through his border

"to cross over his border" or "to cross over into his land"

Jahaz

This is the name of a place. (See: rc://en/ta/man/jit/translate-names)

he fought against Israel

Here "he" refers to King Sihon who represents himself and his army. Alternate translation: "they fought against the Israelites" (See: rc://en/ta/man/jit/figs-synecdoche)