The length of time the Israelite people lived in Egypt was 430 years

 Exodus 12:31-51

During the night Pharaoh summoned Moses and Aaron and said, “Up! Leave my people, you and the Israelites! Go, worship the Lord as you have requested. Take your flocks and herds, as you have said, and go. And also bless me. 

The Egyptians urged the people to hurry and leave the country. “For otherwise,” they said, “we will all die!” So the people took their dough before the yeast was added, and carried it on their shoulders in kneading troughs wrapped in clothing. The Israelites did as Moses instructed and asked the Egyptians for articles of silver and gold and for clothing. The Lord had made the Egyptians favorably disposed toward the people, and they gave them what they asked for; so they plundered the Egyptians.

The Israelites journeyed from Rameses to Sukkoth. There were about six hundred thousand men on foot, besides women and children.

Now the length of time the Israelite people lived in Egypt was 430 years. At the end of the 430 years, to the very day, all the Lord’s divisions left Egypt. Because the Lord kept vigil that night to bring them out of Egypt, on this night all the Israelites are to keep vigil to honor the Lord for the generations to come.

The Lord said to Moses and Aaron, “These are the regulations for the Passover meal: “No foreigner may eat it. Any slave you have bought may eat it after you have circumcised him, but a temporary resident or a hired worker may not eat it. “It must be eaten inside the house; take none of the meat outside the house. Do not break any of the bones. The whole community of Israel must celebrate it.

Just as God foretold, after four centuries in a foreign land Israel is free. The precise length of time may be in a debate: the great, indisputable fact is God's deliverance. The journey to the border begins.

But first, there are further instructions about how the Passover is to be celebrated, who may join in, and where it is to take place. The events are to be further commemorated in two ways:

Why?

All of the events are under the plan of the Lord, Moses, and Aaron and the people of Isreal are follow the instruction of God's word. And when they left they plundered the Egyptians.

The regulations for the Passover meal are the symbols of Jesus Christ on the cross. The Lord has prepared salvation for his people. but only those who follow God can accept this salvation.

430 years later, Israelite left Egypt, the world, and return to the promised land. Before they enter Egypt were 70 people, but they have six hundred thousand men on foot, besides women and children. God makes Israelite to be a big country. It is not a family but a nation that belongs to the Lord.

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以色列人如何出埃及：埃及人催促他們走，風光有尊嚴的離開。公開且離開時埃及人願意送他們東西。

神做事時，這些局勢會完全扭轉過來。

正當那日，耶和華將以色列人按著他們的軍隊，從埃及地領出來。聖經稱他們是軍隊，有能力、有紀律打勝仗的軍隊，是耶和華的夜。他們是有使命，有任務的，不是烏合之眾。

割禮提到3次，只要有受割禮的人才可以過逾越節，吃這羊羔的肉。人要進入這個約裏面才可以。舊約中，割禮代表信靠神。代表人與神立約的記號，也是神的提醒。不要忘記我們是與神立約的人。

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How?

God is great, God is love and righteousness, the Lord is worthy to worship!