וַיֹּ֥אמֶר ל֛וֹ יִצְחָ֥ק אָבִ֖יו מִי־אָ֑תָּה וַיֹּ֕אמֶר אֲנִ֛י בִּנְךָ֥ בְכֹֽרְךָ֖ עֵשָֽׂו׃
And Isaac his father said unto him: ‘Who art thou?’ And he said: ‘I am thy son, thy first-born, Esau.’
Read halakhic rulings (Jewish law) on Genesis 27:32: and classical halakhic sources.