Proverbs 26:24 Kabbalah

בשפתו [בִּ֭שְׂפָתָיו] יִנָּכֵ֣ר שׂוֹנֵ֑א וּ֝בְקִרְבּ֗וֹ יָשִׁ֥ית מִרְמָֽה׃

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

Read kabbalistic (mystical) interpretation of Proverbs 26:24: and classical mystical sources.