And Abraham lifted up his eyes and looked, and behold, behind him was a ram, caught in a thicket by his horns. And Abraham went and took the ram and offered it up as a burnt offering instead of his son.” - Genesis 22:13
Rams as they appear in Scripture
Abram's sacrifice of a ram as the Abrahamic covenant is established
When the Lord was establishing the Abrahamic covenant with Abram, Abram asked how he was to know that he is to possess the promised land. The Lord told him, “Bring me a heifer three years old, a female goat three years old, a ram three years old, a turtledove, and a young pigeon.” He brought them, cut all but the birds in half, and laid each half over against the other. When birds of prey came down on the carcasses, Abram drove them away. Abram fell into a deep sleep, and the Lord revealed the future of the nation that would descend from him. (Genesis 15)
A ram takes Isaac's place
When God was testing whether Abraham would withhold his only son from Him, Abraham and Isaac went up to Mount Moriah together. Carrying the wood and his father carrying the fire and knife, Isaac asked, "Behold, the fire and the wood, but where is the lamb for a burnt offering?" Abraham said, “God will provide for himself the lamb for a burnt offering, my son.” Then when they came to the place of which God had told him, Abraham built the altar there and laid the wood in order and bound Isaac his son and laid him on the altar, on top of the wood. As Abraham took the knife to slaughter Isaac, the angel of the Lord stopped him and Abraham lifted up his eyes and saw behind him was a ram, caught in a thicket by his horns. He offered it up as a burnt offering instead of his son.
(Genesis 22)