Deḇarim (Deuteronomy) 13:1-3

“When there arises among you a prophet or a dreamer of dreams, and he shall give you a sign or a wonder, and the sign or the wonder shall come true, of which he has spoken to you, saying, ‘Let us go after other mighty ones – which you have not known – and serve them,’ do not listen to the words of that prophet or that dreamer of dreams, for יהוה your Elohim is trying you to know whether you love יהוה your Elohim with all your heart and with all your being.