Deuteronomy 18:17-22

17And the LORD said to me, They have well spoken of that which they have spoken. 18I will raise up to them a Prophet from among their brethren, like thee, and will put my words in his mouth; and he shall speak to them all that I shall command him. 19And it shall come to pass, that whoever will not hearken to my words which he shall speak in my name, I will require it of him. 20But the prophet, who 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. 21And if thou shalt say in thy heart, How shall we know the word which the LORD hath not spoken? 22When a prophet speaketh in the name of the LORD, if the thing doth not follow, 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.