What does Abraham's son think is going to happen?

Abraham's son, Isaac, likely thinks they are going to make a sacrifice as part of their journey to the mountain. He notices the preparation, including the firewood and the knife, but questions the absence of a lamb for the offering. This indicates his confusion and trust in his father's intentions, as he believes they will fulfill their religious duty together. However, he is unaware of the deeper significance of their mission and the test of faith that awaits them.