1 Chronicles 11:42

(42) A captain of the Reubenites (or, chief; Heb., head) and thirty with him (besides him).—Literally, upon him. So LXX. Syriac reads “and he was commanding thirty men,” which gives the apparent meaning of the verse. If, as seems likely, the “thirty” were the officers of David’s guard of six hundred warriors (1 Samuel 23:13; 1 Samuel 30:10; 2 Samuel 15:18), called “the mighty men,” or heroes (2 Samuel 10:7; 2 Samuel 20:7; 1 Kings 1:8). each captain would lead about twenty men. Adina’s corps is mentioned perhaps as being larger than usual.