These also are the chief of the mighty men whom David had, who strengthened themselves with him in his kingdom, and with all Israel, to make him king, according to the word of the LORD concerning Israel.
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George Leo Haydock
These. Besides the help which David received immediately from God, he derived great assistance from Joab, the captain-general, from the six more renowned valiant men, and from the body of Thirty, as well as from fifteen others of less note, who are mentioned here. (Haydock)