כֹּ֤ה אָמַר֙ אֲדֹנָ֣י יְהוִ֔ה ה֖וֹי עַל־הַנְּבִיאִ֣ים הַנְּבָלִ֑ים אֲשֶׁ֥ר הֹלְכִ֛ים אַחַ֥ר רוּחָ֖ם וּלְבִלְתִּ֥י רָאֽוּ׃
Thus saith the Lord GOD: Woe unto the vile prophets, that follow their own spirit, and things which they have not seen!
Read halakhic rulings (Jewish law) on Ezekiel 13:3: and classical halakhic sources.