Genesis 22:13

And Abraham lifted up his eyes and looked, and, behold, behind him a ram caught in a thicket by his horns. And Abraham went and took the ram, and offered him up for a burnt offering in the stead of his son. God here directed the attention of Abraham to the ram in the background, overlooked by him till now, caught in the thicket on the mountainside with his long, crooked horns. Acting upon the suggestion, he made the ram the sacrificial animal in the stead of his son Isaac, the ram thus, as in many of the later sacrifices, being the symbolical representation, taking the place of him who was destined to die. That fact also gave the great value to the sacrifice of Christ, for it was made for us, in our stead.