The Passover lamb was the animal God directed the Israelites to use as a sacrifice in Egypt on the night God struck down the firstborn sons of every household (Exodus 12:29). This was the final plague God issued against Pharaoh, and it led to Pharaoh releasing the Israelites from slavery (Exodus 11:1). After that fateful night, God instructed the Israelites to observe the Passover Feast as a lasting memorial (Exodus 12:14).