A follow up on the Plagues MercyandFaith.
Working backwards we know Jesus was the "real" Passover lamb and that relates all the way back to the Exodus. In the middle we have the Law and sacrificial system that help us understand what God was doing and how Jesus' death on the cross could take away our sin. And this is spoken of in Hebrews where the writer says, "But when Christ appeared as a high priest of the good things having come, He entered through the greater and more perfect tabernacle, not made by hands, that is, not of this creation; and not through the blood of goats and calves, but through His own blood, He entered the holy place once for all time, having obtained eternal redemption." (Heb 9:11-12)
Now in the legal world for evidence to be accepted there has to be a "chain of evidence" from start to finish. If a gun claimed to be used in a crime goes missing for a while before the trial then how do we know it's the same gun? It can't be used in evidence.
So in the Bible everything has to be consistent, agree etc. In the setting up of the Levitical priesthood we read, "Again the Lord spoke to Moses, saying, "Now, behold, I have taken the Levites from among the sons of Israel instead of every firstborn, the firstborn of the womb among the sons of Israel. So the Levites shall be Mine. For all the firstborn are Mine; on the day that I fatally struck all the firstborn in the land of Egypt, I sanctified to Myself all the firstborn in Israel, from the human firstborn to animals. They shall be Mine; I am the Lord." (Num 3:11-13). Notice God says, "on the day that I fatally struck all the firstborn in the land of Egypt, I sanctified to Myself all the firstborn in Israel". If God didn't strike down the firstborn in Egypt as He said He did then the chain of evidence is broken and so the argument that Jesus is the Lamb of God who takes away the sin of the world, and our High Priest cannot be validly made.
If God did not do the things He said He did then we might as well "eat, drink and be merry", as we are stuck.