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

"Tell Ben-Hadad, 'Do not boast as if you have already won a battle that you have not yet fought.'"

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

"Let him who puts his armor on not boast like him who takes it off". This is a proverb.