2 Chronicles 18:21

21And he responded, ‘I will go forth, and I will be a lying spirit in the mouth of all his prophets.’ And the Lord said: ‘You will deceive and prevail. Go forth and do so.’
18:21The deceiving spirit was a fallen angel. God did not order him to lie and to deceive, but merely permitted him to do so because of the sins of Israel and of Judah and of their leaders.(Conte)
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