Saul and the people; the one proposed to do so, and the other consented to it, and so both were guilty. All that was good; which it is more than probable they reserved for their own use, rather than for sacrifice, because they knew God would not accept a sacrifice contrary to his own command. Thus they obey God only so far as they could without inconvenience to themselves; they destroyed only what was not worth keeping, nor fit for their use.
Related Commentaries of 1 Samuel 15:9
1 Samuel 15:9
9 But Saul and the people spared Agag, and the best of the sheep, and of the oxen, and of the fatlings,a and the lambs, and all that was good, and would not utterly destroy them: but every thing that was vile and refuse, that they destroyed utterly.