Ellicott's Commentary for English Readers - Deuteronomy 4:2
(2) Ye shall not add unto the word.—The word, not “the words.” The word is the substance of the Law. The words in which it is expressed may be more or less. The law of Moses contains in it the germ of all revelation to the very end. read more
John Dummelow's Commentary on the Bible - Deuteronomy 4:1-49
Exhortations To ObedienceThis chapter contains the practical part of the discourse. Having briefly rehearsed the experiences of the Israelites in the wilderness up to the present point, Moses closes with an eloquent appeal not to forget what they had seen and learned, but to keep the commandments of the Lord. The argument is quite evangelical. Jehovah of His own free grace has chosen and redeemed this people, they ought, therefore, to love and serve Him alone: cp. Joshua’s exhortation in Joshua... read more