For Moses truly said unto the fathers, A prophet shall the Lord your God raise up unto you of your brethren, like unto me; him shall ye hear in all things whatsoever he shall say unto you.
[For] Moses truly said (Deuteronomy 18:15) - here quoted almost verbatim --
[Unto the fathers]. The bracketed words х gar (G1063) and pros (G4314) tous (G3588) pateras (G3962)] are clearly not genuine, being attested only by a few cursive manuscripts; but they are an ancient addition.
A prophet shall the Lord your God raise up unto you of your brethren, like unto me (i:e., Moses) - particularly in 'intimacy of commumcation with God,' and 'as the mediatorial Head of a new order of things.' (See. Hebrews 3:2-6.) The apostle takes it for granted that, in the light of all he had just said, it would be seen at once that One only had any claim to be that Prophet.
Him shall ye hear in all things whatsoever he shall say unto you.