וְלֹ֣א הִכִּיר֔וֹ כִּֽי־הָי֣וּ יָדָ֗יו כִּידֵ֛י עֵשָׂ֥ו אָחִ֖יו שְׂעִרֹ֑ת וַֽיְבָרְכֵֽהוּ׃
And he discerned him not, because his hands were hairy, as his brother Esau’s hands; so he blessed him.
Read halakhic rulings (Jewish law) on Genesis 27:23: and classical halakhic sources.