John Gills Exposition of the Bible Commentary - 1 Chronicles 12:18
Then the spirit came upon Amasai ,.... Or "clothed" F6 לבשה "induit", Pagninus, Montanus, &c.; him; a spirit of fortitude, as the Targum, of strength, courage, and presence of mind, with which he was endowed, covered, and clothed as with a garment; this was a sister's son of David's, see 2 Samuel 17:25 . who was chief of the captains ; of them that came at this time with him to David; he was afterwards Absalom's general, and designed to be David's, but was murdered by Joab:... read more
Matthew Henry's Complete Commentary - 1 Chronicles 12:1-22
We have here an account of those that appeared and acted as David's friends, upon the death of Saul, to bring about the revolution. All the forces he had, while he was persecuted, was but 600 men, who served for his guards; but, when the time had come that he must begin to act offensively, Providence brought in more to his assistance. Even while he kept himself close, because of Saul (1 Chron. 12:1), while he did not appear, to invite or encourage his friends and well-wishers to come in to him... read more