I have written on this theme of Passover before, but not specifically about how it relates to God bringing about a holy nation. I decided it would be a good venture, even though some scriptures are repeated.
The very first thing God promised Abraham was that He would make him a great nation. Abraham begat Isaac and he begat Jacob who brought forth 12 sons. We are familiar with the life of Joseph and how he was sold and ended up in Egypt. Jacob and his sons were united with Joseph in Egypt in a time of famine and Israel grew in numbers during their stay there that spanned a period of over 400 years. It was at the end of that period that God sent Moses to Pharoah to tell him to "Let My people go." When God called Moses, it was because of His promise to Abraham:
We all know what happened after that. The Lord brought His promise to Abraham to fruition and it has been said that over 600,000 marched out of Egypt on the day of the exodus:
One of the reasons God allowed Israel to be held in slavery in Egypt was that they might multiply, and multiply they did. God would bring them out of Egypt as a nation, and issued a call to this nation to be a holy nation peculiar to Himself:
"All that the LORD hath spoken we will do." Sometimes they did, and sometimes they didn't. But God said He wanted a HOLY nation, and speaking of a future time, told Moses,
When Jesus came, He fulfilled these words, but not all listened. Jesus said to the leaders of Israel in His time, "The kingdom of God shall be taken from you, and given to a nation bringing forth the fruits thereof." The response to such statements was, "they sought to lay hands on him" (V. 46). Notice, too, in this same verse, "they feared the multitude, because they took him for a prophet."
He drew out of the nation formed by the physical seed of Abraham a nation purified by faith in Him. Just as Israel as a nation received the Old Covenant at Sinai, so did this nation, His Church, receive the New Covenant implemented through the feast of Passover. In a time of bondage under Rome, Jesus came to this nation that God had brought out of Egypt, and said,
What "nation" is Jesus speaking of here? We know now He was speaking of the spiritual seed of Abraham, His Church, that stood within natural Israel and to which the Gentiles would be added. Through the centuries, God would then add Jews and Gentiles to this nation out of all the nations, all who believed on the Lord Jesus Christ. This state of His Church would prevail until "all Israel should be saved" (Romans 11:25, 26), meaning a remnant He would preserve out of endtime-Israel. In a sense, when Jesus came, He took a nation out of a nation as He did with Egypt. That He did this is stated in 1 Peter:
(See my series, "A Brief History Of The Redefined Abrahamic Covenant: The Church And Israel In The Last Days" on my web page.)