20:12 Stood still - Wondering at the spectacle, and enquiring into the author and occasion of it. Removed - Perceiving, that it both incensed them against Joab and hindered the king's service. Cast a cloth upon him - But the covering of blood with a cloth cannot stop its cry to God for vengeance.
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.