Of my bone ... - Render as in preceding verse, “art thou not my bone and my flesh?” It is curious to note how the phrase is used in 2 Samuel 5:1 of common descent from Israel, in 2 Samuel 19:12 of the closer kindred of the tribe of Judah, and in this verse of the yet nearer kindred between David and Amasa his sister’s son.
Captain ... in the room of Joab - It is very plain that David felt the weight of Joab’s overbearing influence to be very oppressive (compare 2 Samuel 19:22; 2 Samuel 3:39; 2 Samuel 16:10). He was, at this time, very angry with Joab for killing Absalom; and so, thinking it of vital importance to win over Amasa and the army of Judah, he did not scruple to offer him Joab’s high post.