2 Samuel 11:6

6Then David sent to Joab, saying, “Send me Uriah, the Hittite.” And Joab sent Uriah to David.
11:6David intended to murder Uriah in this way, so he is guilty of an actual mortal sin. But Joab did not carry out the full instruction of David: though he positioned Uriah in a place where the enemy soldiers were strongest, he did not fall back and abandon Uriah. So David was guilty of murder, but not Joab.(Conte)
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