If you are unfamiliar with this story I would encourage you to read it in Genesis 22.
In verse 7, Isaac asked his dad while they were walking up Mt. Moriah, where the sacrifice was.
They had the wood and the supplies to make a fire, there were plenty of stones for the altar, there was rope... but... Where's the sacrifice?
Abraham replied that God would provide the Lamb.
But God didn't provide the Lamb.
Not on that day.
What does the story say?
'But the angel of the LORD called out to him from heaven, “Abraham! Abraham!”
“Here I am,” he replied.
“Do not lay a hand on the boy,” he said. “Do not do anything to him. Now I know that you fear God, because you have not withheld from me your son, your only son.”
Abraham looked up and there in a thicket he saw a ram caught by its horns. He went over and took the ram and sacrificed it as a burnt offering instead of his son. So Abraham called that place The LORD Will Provide. And to this day it is said, “On the mountain of the LORD it will be provided.” ' -Genesis 22:11-14 NIV
A ram. A ram stuck in a thicket... or a thorn bush.