עַד־מָתַ֗י הֲיֵ֛שׁ בְּלֵ֥ב הַנְּבִאִ֖ים נִבְּאֵ֣י הַשָּׁ֑קֶר וּנְבִיאֵ֖י תַּרְמִ֥ת לִבָּֽם׃
How long shall this be? Is it in the heart of the prophets that prophesy lies, And the prophets of the deceit of their own heart?
Read midrashic interpretation of Jeremiah 23:26: and classical rabbinic exegesis.