1 Chronicles 19:8-13

8When David heard of it, he sent Joab and all the army, the mighty men. 9The sons of Ammon came out and drew up in battle array at the entrance of the city, and the kings who had come were by themselves in the field.

10Now when Joab saw that the 1battle was set against him in front and in the rear, he selected from all the choice men of Israel and they arrayed themselves against the Arameans. 11But the remainder of the people he placed in the hand of 2Abshai his brother; and they arrayed themselves against the sons of Ammon. 12He said, “If the Arameans are too strong for me, then you shall help me; but if the sons of Ammon are too strong for you, then I will help you. 13Be strong, and let us show ourselves courageous for the sake of our people and for the cities of our God; and may the Lord do what is good in His sight.”