The LORD thy God will raise up unto thee a Prophet from the midst of thee, of thy brethren, like unto me; unto him ye shall hearken; According to all that thou desiredst of the LORD thy God in Horeb in the day of the assembly, saying, Let me not hear again the voice of the LORD my God, neither let me see this great fire any more, that I die not. And the LORD said unto me, They have well spoken that which 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; and he shall speak unto them all that I shall command him. 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. 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. And if thou say in thine heart, How shall we know the word which the LORD hath not spoken? 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.
Behold, I will send my messenger, and he shall prepare the way before me: and the Lord, whom ye seek, shall suddenly come to his temple, even the messenger of the covenant, whom ye delight in: behold, he shall come, saith the LORD of hosts.
Making the word of God of none effect through your tradition, which ye have delivered: and many such like things do ye.
Just to clarify my previous comments about a Commander and a messenger coming from a Commander. It was a military commander; imagine a general. The messenger; imagine a courier.
If a courier arrives to you in the midst of a battle with a message supposedly from the commander, you have to authenticate the message that the courier is bringing.
Once you do authenticate the message, the courier isn’t the issue. The issue is that the General has issued an order and that order if written down in front of your eyes.
If the Commander’s message said “Take hill 1782” and the courier says “No, I want you to take hill 597”, that should prompt you to say, “What...are you nuts?” If he replies, “Well, I carried and authenticated that written message from the General to you, so I’m now in charge.”, then you know that he’s gotten himself wrapped around the axle.