Genesis 27:21

And Isaac said unto Jacob, Come near, I pray thee, that I may feel thee, my son, whether thou be my very son Esau or not.

Cross-reference

Genesis 27:12 is Jacob's fear that Isaac will feel him and discover the deception — this is that exact moment unfolding.

Genesis 27:19 continues directly here — after Jacob's initial lie, Isaac now seeks to verify by touch.