Today, roughly 1,980 years ago, Jesus observed the Passover with his disciples for the last time, pointing toward the next day when he would become their Passover lamb. His atoning, sin covering, wrath absorbing blood is applied to all who place their faith and trust in Him; those who would have it placed on the proverbial doorposts of their souls.
The first Passover was a shadow, a picture of Christ to come. It pointed year after year to the necessity of blood to cover sin, and the deliverance afforded to those who trusted God. Jesus made the final sacrifice, and covered it once for all.