Abu Sa'id al-Khudri said

When the B. Quraiza surrendered agreeing to have their fate decided by Sa‘d b. Mu'adh Allah's Messenger ﷺ sent for him and he came on an ass. When he drew near Allah's Messenger ﷺ said, “Rise up in respect to your chief.” Then when he had come and sat down Allah's Messenger ﷺ said, “These people have surrendered agreeing that you should decide their fate,” so he said, “I decide that the fighting men be killed and that the offspring be taken into captivity.” He then declared, “You have given regarding them the decision of the King.” A version has, “Allah’s decision.” (Bukhari and Muslim.)