I will raise them up a prophet from among their brethren like unto thee,.... So that it seems this promise or prophecy was first made at Mount Sinai, but now renewed and repeated, and which is nowhere else recorded; see Deuteronomy 18:15 when they were not only made easy for the present by appointing Moses to receive from the Lord all further notices of his mind and will, but were assured that when it was his pleasure to make a new revelation, or a further discovery of his mind and will, in future times, he would not do it in that terrible way he had delivered the law to them; but would raise up a person of their own flesh and blood, by whom it should be delivered, which was sufficient to prevent their fears for the future:

and will put my word in his mouth; the doctrines of the Gospel, which come from God, and are the words of truth, faith, righteousness, peace, pardon, life, and salvation; and which Christ says were not his own, as man and Mediator, but his Father's, which he gave unto him, and put into his mouth, as what he should say, teach, and deliver to others; see John 7:16.

and he shall speak unto them all that I shall command him; nor did he keep back, but faithfully declared the whole counsel of God; and as he gave him a commandment what he should say, and what he should speak, he was entirely obedient to it; see John 12:49.

I will raise them up a Prophet from among their brethren, like unto thee, and will put my words in his {h} mouth; and he shall speak unto them all that I shall command him.

(h) A promise not only made to Christ, but to all that teach in his name, Isa 59:21.

18:15-22 It is here promised concerning Christ, that there should come a Prophet, great above all the prophets; by whom God would make known himself and his will to the children of men, more fully and clearly than he had ever done before. He is the Light of the world, Joh 8:12. He is the World by whom God speaks to us, Joh 1:1; Heb 1:2. In his birth he should be one of their nation. In his resurrection he should be raised up at Jerusalem, and from thence his doctrine should go forth to all the world. Thus God, having raised up his Son Christ Jesus, sent him to bless us. He should be like unto Moses, only above him. This prophet is come, even JESUS; and is He that should come, and we are to look for no other. The view of God which he gives, will not terrify or overwhelm, but encourages us. He speaks with fatherly affection and Divine authority united. Whoever refuses to listen to Jesus Christ, shall find it is at his peril; the same that is the Prophet is to be his Judge, Joh 12:48. Woe then to those who refuse to hearken to His voice, to accept His salvation, or yield obedience to His sway! But happy they who trust in Him, and obey Him. He will lead them in the paths of safety and peace, until He brings them to the land of perfect light, purity, and happiness. Here is a caution against false prophets. It highly concerns us to have a right touchstone wherewith to try the word we hear, that we may know what that word is which the Lord has not spoken. Whatever is against the plain sense of the written word, or which gives countenance or encouragement to sin, we may be sure is not that which the Lord has spoken.