Proclaiming a message to be from God is of extreme responsibility. God has less than nothing good to say about those who partake of such evil at the devil's table. In fact, it is a death sentence no matter which testament you study.
The following from 'Got Questions' is pretty straightforward with Bible references for further study if anyone is so inclined
A false prophet is a person who spreads false teachings or messages while claiming to speak the Word of God. In the Bible, false prophets also spoke on behalf of false gods. False prophets functioned in their prophetic role illegitimately or for the purpose of deception. The Bible denounces false prophets for leading people astray.
In the Old Testament, the actual term false prophet does not occur, but references to false prophets are evident and abundant. In the book of Jeremiah, we encounter a clear description of false prophets: “Then the LORD said to me, ‘The prophets are prophesying lies in my name. I have not sent them or appointed them or spoken to them. They are prophesying to you false visions, divinations, idolatries and the delusions of their own minds’” (Jeremiah 14:14; see also 23:21–33; Zechariah 10:2).
The primary difference between men like Jeremiah—a true prophet of God—and false prophets was their source of information. Rather than speak the Word of the Lord, false prophets delivered messages that originated in their own hearts and minds: “This is what the LORD Almighty says: ‘Do not listen to what the prophets are prophesying to you; they fill you with false hopes. They speak visions from their own minds, not from the mouth of the LORD’” (Jeremiah 23:16; see also 14:14; 23:25–32; Ezekiel 13:1–7). God distances Himself from all false prophets: “I did not send these prophets, yet they have run with their message; I did not speak to them, yet they have prophesied” (Jeremiah 23:21).
Another difference between true prophets and false prophets in the Bible is motivation. True prophets are motivated by loyalty to God above all else, whereas false prophets are motivated by self-interest and a desire to be popular among the people (1 Kings 22:13–14). While Jeremiah foretold the grim truth of coming desolation upon Jerusalem (Jeremiah 4), the false prophets promised peace (Jeremiah 6:14; 8:11). Naturally, the people of Judah preferred the pleasant messages of the false prophets: “Don’t tell us what is right. Tell us nice things. Tell us lies” (Isaiah 30:10, NLT).
The punishment specified for false prophets in the Old Testament was severe: “If any prophet dares to speak a message in My name that I have not commanded him to speak, or to speak in the name of other gods, that prophet must be put to death” (Deuteronomy 18:20).
The following from 'Got Questions' is pretty straightforward with Bible references for further study if anyone is so inclined
A false prophet is a person who spreads false teachings or messages while claiming to speak the Word of God. In the Bible, false prophets also spoke on behalf of false gods. False prophets functioned in their prophetic role illegitimately or for the purpose of deception. The Bible denounces false prophets for leading people astray.
In the Old Testament, the actual term false prophet does not occur, but references to false prophets are evident and abundant. In the book of Jeremiah, we encounter a clear description of false prophets: “Then the LORD said to me, ‘The prophets are prophesying lies in my name. I have not sent them or appointed them or spoken to them. They are prophesying to you false visions, divinations, idolatries and the delusions of their own minds’” (Jeremiah 14:14; see also 23:21–33; Zechariah 10:2).
The primary difference between men like Jeremiah—a true prophet of God—and false prophets was their source of information. Rather than speak the Word of the Lord, false prophets delivered messages that originated in their own hearts and minds: “This is what the LORD Almighty says: ‘Do not listen to what the prophets are prophesying to you; they fill you with false hopes. They speak visions from their own minds, not from the mouth of the LORD’” (Jeremiah 23:16; see also 14:14; 23:25–32; Ezekiel 13:1–7). God distances Himself from all false prophets: “I did not send these prophets, yet they have run with their message; I did not speak to them, yet they have prophesied” (Jeremiah 23:21).
Another difference between true prophets and false prophets in the Bible is motivation. True prophets are motivated by loyalty to God above all else, whereas false prophets are motivated by self-interest and a desire to be popular among the people (1 Kings 22:13–14). While Jeremiah foretold the grim truth of coming desolation upon Jerusalem (Jeremiah 4), the false prophets promised peace (Jeremiah 6:14; 8:11). Naturally, the people of Judah preferred the pleasant messages of the false prophets: “Don’t tell us what is right. Tell us nice things. Tell us lies” (Isaiah 30:10, NLT).
The punishment specified for false prophets in the Old Testament was severe: “If any prophet dares to speak a message in My name that I have not commanded him to speak, or to speak in the name of other gods, that prophet must be put to death” (Deuteronomy 18:20).
