Proverbs 26:19 Midrash

כֵּֽן־אִ֭ישׁ רִמָּ֣ה אֶת־רֵעֵ֑הוּ וְ֝אָמַ֗ר הֲ‍ֽלֹא־מְשַׂחֵ֥ק אָֽנִי׃

So is the man that deceiveth his neighbour, And saith: ‘Am not I in sport?’

Read midrashic interpretation of Proverbs 26:19: and classical rabbinic exegesis.