God's promise to us as sinners is eternal life through the Passover.
"But God demonstrates his own love for us in this: While we were still sinners, Christ died for us." Romans 5:8
"When the hour came, Jesus and his apostle reclined at the table. And he said to them, "I have eagerly desired to eat this Passover with you before I suffer." Luke 22:14-15
Christ knew that the very next day he was going to suffer the most painful of deaths. Why was he so eager to eat the feast of the Passover with his disciples?
"But go and learn what this means: I desire mercy, not sacrifice. For I have not come to call the righteous, but sinners." Matthew 9:13
Jesus Christ let us understand that his purpose for coming to this earth was to save the sinners. In what way did he do so? By keeping the Passover, what was He eagerly awaiting to give his disciples?
"So the disciples did as Jesus had directed them and prepared the Passover...While they were eating, Jesus took bread, gave thanks and broke it and gave it to his disciples saying, "Take and eat this is my body." Then he took the cup, gave thanks and offered it to them, saying, "Drink from it all of you. This is my blood of the covenant, which is poured out for many for the forgiveness of sins." Matthew 26:17-27
The feast of the Passover wasn't kept the Old Covenant way as testified in the Old Testament. When Christ gave his disciples the Passover, he eagerly awaited the moment; for in the Feast of the Passover Jesus Christ was giving his disciples his flesh and blood which is the promise of the forgiveness of sins. Without receiving the flesh and blood of Christ we do not have that promise and our sins are not forgiven. That is why Christ said his flesh is real food and blood is real drink (John 6:53) When we receive his flesh and blood the very promise that was given to the disciples is also given to us at the appointed time of keeping the feast of the Passover.
Jesus Christ came to this earth to save sinners by shedding his flesh and blood and opening up the way for us to keep the New Covenant Passover and be forgiven of our sins.
In these last days the Passover has been brought back as the Bible testified; Christ must appear once again to bring Salvation to those who are waiting for him (Hebrews 9:28) Salvation comes through eating the Passover, and the Passover was brought back by Christ Ahnsahnghong in 1948.