And the king of Israel answered, “Tell him, ‘Let not him who straps on his armor boast himself as he who takes it off.’”
Here is, I. The threatening descent which Ben-hadad made upon Ahab's kingdom, and the siege he laid to Samaria, his royal city, Kg1 20:1. What the ground of the quarrel was we are not told; covetousness and ambition were the principle, which would never want some pretence or other.
Commenting on 1 Kings 20:1-11
Very mildly and very wisely: tell him, let not him that girdeth on his harness boast himself as he that putteth it off; that is, he that prepares for the battle as he that has got the victory; the sense is, let no man triumph before the battle is over and the victory won; the events of war are uncertain; the battle is not always to the strong.
And the king of Israel answered and said, Tell [him], Let not him that girdeth on [his harness] boast himself as he that putteth it off. (f) Do not boast before the victory is won.