Proverbs 26:24 Halakhah

בשפתו [בִּ֭שְׂפָתָיו] יִנָּכֵ֣ר שׂוֹנֵ֑א וּ֝בְקִרְבּ֗וֹ יָשִׁ֥ית מִרְמָֽה׃

He that hateth dissembleth with his lips, But he layeth up deceit within him.

Read halakhic rulings (Jewish law) on Proverbs 26:24: and classical halakhic sources.