Are the Commandments, sayings and words of Jesus actually the words of God the Father like Deu 18:18-21 and John 12:49-50 say they are?

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

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

20 But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.

21 And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?

22 When a prophet speaketh in the name of the LORD, if the thing follow not, nor come to pass, that is the thing which the LORD hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.

Deut 18:18-22 (KJV)

---

49 For I have not spoken of myself; but the Father which sent me, he gave me a commandment, what I should say, and what I should speak.

50 And I know that his commandment is life everlasting: whatsoever I speak therefore, even as the Father said unto me, so I speak.

John 12:49-50 (KJV)