אָר֕וּר מַשְׁגֶּ֥ה עִוֵּ֖ר בַּדָּ֑רֶךְ וְאָמַ֥ר כָּל־הָעָ֖ם אָמֵֽן׃ (ס)
Cursed be he that maketh the blind to go astray in the way. And all the people shall say: Amen.
Read kabbalistic (mystical) interpretation of Deuteronomy 27:18: and classical mystical sources.