It is proposed in this paper that the law in Deut. xxi 18-21 constitutes a legal inno-vation in its denition of the "wayward and deant" child who should be put to death because of denial of his parents' authority. The protasis (v. 18) presents the custom-ary law regarding the denition of the disobedient male child and, in essence, is sim-ilar to the law of Exod. xxi 17. The first part of the apodosis (vv. 19-20), on the other hand, redenes it. In the innovation, only the son who disobeys his father and mother and refuses to cease his gluttony and drinking is the disobedient son who should be put to death by stoning.