(28-31) And the Lord heard the voice of your words... — The Divine comment on the words of the people is recorded only in Deuteronomy; but in order to obtain a complete record of it, we must refer to Deuteronomy 18:18-19. It will appear by comparison of the two passages that the promise of the prophet like unto Moses was given at this very time: “They have well said all that they have spoken. I will raise them up a prophet from among their brethren, like unto thee, and will put my words in His mouth.” It is not a little remarkable that He who gave the Law from Sinai “in blackness and darkness and tempest” should, on that very day, acknowledge the need of a different form of teaching for His people, and should promise it then and there. But it must not be forgotten that He “whose voice then shook the earth” is the very same Person who “speaketh from heaven” now. He who pronounced the Law in the letter writes it on the heart by His Spirit. The Angel of the covenant and the Prophet like unto Moses are one. He who gave the Law on Sinai died under it on Calvary, and provided for its observance for ever.
(29) O that there were such an heart in them. — Literally, Who will give that there shall be this heart in them, to fear me, and to keep all my commandments all the days? He who asked the question has also supplied the, answer: “I will put my laws in their hearts, and in their minds will I write them.” Or, more exactly, in Hebrews 8:10, “Giving my laws into their understanding, I will also write them upon their hearts.” The need of a Mediator like themselves was well stated by the people; it was also met by Him who said, “They have well said all that they have spoken.”