The word of the Lord came to Abram in a vision… But Abram said, “Lord, what can you give me. “You have given me no children; a servant in my household will be my heir.” God also said to Abraham, “As for your wife, you are no longer to call her Sarai; her name will be Sarah. I will bless her and will give you a son by her.
Abraham and Sarah laughed, but the baby, Isaac, was born.
And then God said: “Take your son and sacrifice him as a burnt offering. Abraham reached out his hand to slay his son. But the angel of the Lord called out to him. Do not lay a hand on the boy,” he said. “Do not do anything to him. Abraham saw a ram caught in a thicket and he took the ram and sacrificed it as a burnt offering instead of his son. (From Genesis 15-22, NIV)
And Abraham understood the sacrifice of one life for another. This is the first time this is mentioned in scripture. It is fulfilled in Christ. For even the Son of Man did not come to be served, but to serve, and to give his life as a ransom for many.” (Mark 10:45, NIV)
Surely, he took up our pain and bore our suffering, yet we considered him punished by God,
stricken by him, and afflicted. But he was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was on him, and by his wounds, we are healed. We all, like sheep, have gone astray, each of us has turned to our own way; and the Lord has laid on him the iniquity of us all. (Isaiah 53:4-6, NIV)