en_tn/1sa/18/16.md

all Israel and Judah loved David

Here "Israel and Judah" represent the people of all of the tribes. Alternate translation: "all the people in Israel and Judah loved David" (See: rc://en/ta/man/jit/figs-metonymy)

went out and came in before them

The phrases "went out" and "came in" are idioms that refer to leading the people into battle and leading them home from battle. See how you translated this in 1 Samuel 18:13. Alternate translation: "led his soldiers into battle and led them home from battle" (See: rc://en/ta/man/jit/figs-idiom)