פּירוש אויף בראשית 22:7

“And he said, ‘My father,’ etc.” Isaac had not yet said anything to him, but merely called out my father and was silent. This was because Isaac sensed that his father’s intention was to offer him as a burnt offering, and he thought, “If so, he is not showing me mercy as a father should have for his children, and has turned cruel toward me” — for he did not yet know that this was the Creator’s will. Therefore, he called out my father to test whether he would answer him, [to determine] if it was still fixed in his heart that he was his father, or if he had already dismissed it from his heart as if he were not his son. Through this, he wanted to know who would be sacrificed. When Abraham answered him Here I am, my son, showing that he still had all his paternal longings for him, Isaac then said, “If so, where is the lamb for the burnt offering?” Abraham replied, God will see to the lamb for the burnt offering, my son — meaning, “It was not I who chose you, but God, and both you and I are obligated to honor Him.” Only then did they both walk together with one intention, whereas until this point they had been divided in their thoughts.

הנני בני, with a dagesh also in the second letter נ.

And he said, "Father": And he did not immediately ask, "Where is the lamb." As he sensed something wonderous, but he did not find the heart to ask until after reflecting upon the answer of his father - whether it would be with a pleasant countenance and love. Therefore when he answered him, "Here I am, my son" - which was a loving answer - he then asked to know.