en_tn/1ki/20/11.md

Tell Ben-Hadad, 'No one who is just putting on his armor ... as if he were taking it off.'

This is an expression to give advice. "Putting on armor" is metonymy for getting prepared for battle. "Tell Ben-Hadad, 'Do not boast as if you have already won a battle that you have not yet fought.'" (See: rc://en/ta/man/jit/writing-proverbs and rc://en/ta/man/jit/figs-metonymy)

No one who girding on his armor should boast as if he were taking it off

This is a proverb, so you may want to make it as brief and easy to say as possible. Alternate translation: "Let him who puts his armor on not boast like him who takes it off"