We will have no silver nor gold of Saul, &c. Neither silver nor gold was a just equivalent for the loss they had sustained by Saul and his bloody house. Neither for us shalt thou kill any man in Israel Except of Saul's family, as it here follows. The marginal reading, however, seems preferable, Neither pertains it to us to kill any man, &c. They were in such a state of servitude as did not allow them to take the only proper retribution, blood for blood. This appears to be the meaning, because David immediately replies, What you shall say, that will I do.
Related Commentaries of 2 Samuel 21:4
2 Samuel 21:4
4 And the Gibeonites said unto him, We will have no silver nor gold of Saul, nor of his house; neither for us shalt thou kill any man in Israel. And he said, What ye shall say, that will I do for you.