This reading is from the portion read on the second day of Rosh Hashanah, which falls on September 28 this year..
Some time afterward, God put Abraham to the test. He said to him, "Abraham," and he answered, "Here I am." And He said, "Take your son, your favored one, Isaac, whom you love, and go to the land of Moriah, and offer him there as a burnt offering on one of the heights that I will point out to you." So early next morning, Abraham saddled his ass and took with him two of his servants and his son Isaac. He split the wood for the burnt offering, and he set out for the place of which God had told him. On the third day Abraham looked up and saw the place from afar. Then Abraham said to his servants, "You stay here with the ass. The boy and I will go up there; we will worship and we will return to you."
Abraham took the wood for the burnt offering and put it on his son Isaac. He himself took the firestone and the knife; and the two walked off together. Then Isaac said to his father Abraham, "Father!" And he answered, "Yes, my son." And he said, "Here are the firestone and the wood; but where is the sheep for the burnt offering?" And Abraham said, "God will see to the sheep for His burnt offering, my son." And the two of them walked on together.