כִּֽי־יְחַנֵּ֣ן ק֭וֹלוֹ אַל־תַּֽאֲמֶן־בּ֑וֹ כִּ֤י שֶׁ֖בַע תּוֹעֵב֣וֹת בְּלִבּֽוֹ׃
When he speaketh fair, Believe him not; For there are seven abominations in his heart.
Read halakhic rulings (Jewish law) on Proverbs 26:25: and classical halakhic sources.