to me] By breaking the agreement which David made with Abner, 2 Samuel 3:26. and with Amasa, 2 Samuel 19:11. Joabs murthering those two might have tended to Davids dishonour.
shed] Heb. put.
of war in peace] Doing hostile actions to confederates in tim of peace.
the blood of war] A bloody sword used in war.
upon his girdle] Into the scabbard that was on his belt.
in his shoes] While he embraced them he kil’d them, so as their blood ran into his shoes. His insolency is further set out by these phrases, in that he carried a bloody sword, and walked with blood in his shoes, as if he had done a worthy deed.