And it shall come to pass, that whosoever will not hearken unto my words which he shall speak in my name, I will {i} require it of him.

(i) By executing punishment on him.

Wesley's Notes

18:19 I will require it - I will punish him severely for it. The sad effect of this threatning the Jews have felt for above sixteen hundred years together.

Jamieson-Fausset-Brown Bible Commentary

19. whosoever will not hearken unto my words which he shall speak in my name, I will require it of him-The direful consequences of unbelief in Christ, and disregard of His mission, the Jewish people have been experiencing during eighteen hundred years.

Matthew Henry's Concise Commentary

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.