Be strong and let us fight bravely for our people and the cities of our God

2 Samuel 10:1-19
David thought, “I will show kindness to Hanun son of Nahash, just as his father showed kindness to me.” So David sent a delegation to express his sympathy to Hanun concerning his father.
The Ammonite commanders said to Hanun their lord, “Do you think David is honoring your father by sending envoys to you to express sympathy? Hasn’t David sent them to you only to explore the city and spy it out and overthrow it?”
Joab said, "Be strong and let us fight bravely for our people and the cities of our God. The Lord will do what is good in his sight.”
When David was told of this, he gathered all Israel, crossed the Jordan and went to Helam. The Arameans formed their battle lines to meet David and fought against him. But they fled before Israel, and David killed seven hundred of their charioteers and forty thousand of their foot soldiers. He also struck down Shobak the commander of their army, and he died there. When all the kings who were vassals of Hadadezer saw that they had been routed by Israel, they made peace with the Israelites and became subject to them.
Why?
These wars are not attacked by Israel, but for Ammonite thought David's bad mind to reconnoiter them. Actually, David showed kindness to them.
Joab knew their fight was with the Lord, fight for the Lord.
David went out to fight with Arameans, David got victory once more, for the Lord is with him.
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亞門人不相信人，反而失去更多約押與亞比塞盡己力，其他交託給神！
世界的結盟是以自己的利益為目的，約押則以彼此幫助來結盟。我們在教會是以己的益處為出發點還是以神的益處為出發點？
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How?
Be strong for our people and the cities of our God.