12 And Amasa is rolling himself in blood, in the midst of the highway, and the man seeth that all the people have stood still, and he bringeth round Amasa out of the highway to the field, and casteth over him a garment, when he hath seen that every one who hath come by him—hath stood still.
Matthew Henry's Commentary on 2 Samuel 20:12
Commentary on 2 Samuel 20:4-13
(Read 2 Samuel 20:4-13)
Joab barbarously murdered Amasa. The more plot there is in a sin, the worse it is. Joab contentedly sacrificed the interest both of the king and the kingdom to his personal revenge. But one would wonder with what face a murderer could pursue a traitor; and how, under such a load of guilt, he had courage to enter upon danger: his conscience was seared.