“The prophets prophesy lies in my name.” It was a very serious sin to say that Yahweh said something that He did not say. Being a false prophet at all is a serious sin, but people who say that Yahweh, the God of Israel, told them to say something that He did not tell them to say are sinning very grievously. If a person says he is a prophet of Baal, God’s people can make a choice as to whether they want to listen or not, but if a person pretends to be a prophet of Yahweh, or says he represents Yahweh when he doesn’t, that requires a whole different level of diligence on the part of God’s people. People who say they represent God when they don’t are in danger of serious consequences, as Jeremiah 14:14-16 shows. Other verses that show false prophets prophesying in God’s name are Jeremiah 23:1-40, Ezekiel 13:1-9 and 13:17-22.