When Abraham brought Isaac to the mountain to sacrifice him, he told Isaac that "God will provide a lamb for himself". Abraham obeyed God in every respect, trusting that somehow he would preserve Isaac through death so that his promise of many descendants would still be kept. Isaac was bound and ready to die when the Angel told Abraham to stop. God did provide an animal in place of Isaac, but it was a ram and not a lamb.
The implication is that God would one day provide another lamb who would die as a substitute for all those whom God counts as children of Abraham, if we have enough faith to trust God no matter what happens.
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