Chasidut zu Bereschit 22:7

‎Genesis 22,7. Concerning Yitzchok’s question of “here is the fire and ‎the kindling, but where is the lamb for the burnt-offering?,” ‎it seems that Yitzchok’s question implied that seeing the ‎principal purpose of his father’s trial was to see if he was ‎prepared to slaughter his son, what need was there for fire and ‎kindling, seeing that after he had been slaughtered surely it did ‎not matter to G’d if his remains would be burned up! Yitzchok ‎wanted his father to know that the kindling and the fire had ‎nothing to do with him, as the intended victim. He wanted to ‎know if there was going to be another offering, i.e. a lamb, as ‎usual. If so, where did his father expect to find it at short notice? ‎When we understand Yitzchok’s question as suggested, we can ‎understand why he did not ask a question concerning the knife to ‎be used in the slaughter. Avraham’s reply, saying that G’d would ‎select who should be the “lamb,” meant that as far his ‎relationship to G’d was concerned, his own son was as valuable to ‎him as if he would burn up an actual lamb for G’d in order to ‎demonstrate his love for Him.‎