The congregation of Israel received its first direct instructions from God concerning the Passover while still in Egypt. On the tenth day of the first month every household was to select a lamb, and on the fourteenth day the whole assembly of the congregation of Israel was to kill it at twilight. With regard to religious activities the nation of Israel was therefore designated the congregation of Israel. Scripture later identifies this same congregation as the church in the wilderness during the days of Moses. The Hebrew term rendered congregation throughout the Old Testament carries the identical meaning as the Greek word for church in the New Testament, a fact confirmed by the Septuagint translation that rendered it ecclesia. Israel functioned simultaneously as a civil kingdom under judges and later kings and as a congregation or church under the leadership of Moses or Joshua together with the priests of the tribe of Levi. Both civil rulers and priests served under the God of the Old Testament, who later became Jesus Christ. In this arrangement the congregation of Israel served as a physical type of the spiritual church of God. While still in Egypt, before the law of Moses was given, the congregation observed the annual holy days and feasts that God later summarized in Leviticus 23, beginning with the weekly Sabbath as the first of His feasts. The congregation was required to keep the ritual and ceremonial laws added to the Old Covenant until Christ should come. These same feasts were observed by Jesus Christ during His ministry and were commanded by Him for His disciples. The apostles continued to keep and teach them to both Jewish and Gentile believers, demonstrating that the practices first given to the congregation of Israel remain binding on the New Testament church.

The text distinguishes the congregation of Israel from the church by noting that Israel is never called the church of God in the Old Testament. Instead, the phrase appears twenty-three times as the congregation of Israel and twelve times as the congregation of the Lord. The term ekklesia carries implications of sanctity and sacred election when joined with God's name, yet Israel receives only the lesser designation tied to the man Jacob. God entered a marriage covenant with Israel at Sinai, sprinkling blood on the people after they affirmed obedience to the terms read from the book of the covenant. This union produced children, yet Israel later committed harlotry, sacrificed those children to idols, and received a certificate of divorce. The resulting separation left the nation without the higher degree of sanctity later granted to the Israel of God under the New Covenant. Deuteronomy records that God withheld from Israel a heart to perceive, eyes to see, and ears to hear, because His purpose for them did not include general conversion through the Spirit. He required two things: that they serve as witnesses to the nations by living His way and that parents produce godly offspring by faithful instruction. Both responsibilities went unfulfilled. The text places this limited role within the larger sequence of God's plan. After Israel's failure and divorce, God waited centuries before sending His Son to call out a different assembly—the church, described as Christ's living body and spiritual temple. This New Covenant assembly receives the Spirit, forgiveness, and the charge to prepare as firstfruits for future rule with Christ. The congregation of Israel thus functions as an earlier, preparatory stage that highlights both the necessity and the greater demands of the church's sanctification.

In the material, the congregation of the Lord refers to the assembly in which individuals could hold public office such as priest, elder at the gate, or judge. Deuteronomy 23:2 states that one of illegitimate birth shall not enter the congregation of the Lord even to the tenth generation, and Deuteronomy 23:3 extends the same restriction to an Ammonite or Moabite and his descendants forever. These exclusions did not bar such persons from the community itself but prevented them from positions of leadership. The law was given to a carnal nation whose concerns remained physical, so its purpose was to promote physical purity by discouraging sexual promiscuity that could spread disease and by ensuring that those who reached leadership would possess the stability associated with a normal family upbringing rather than the psychological scars that often accompanied illegitimate birth. The same principle appears in Jeremiah 31:29-30 and Ezekiel 18:19-23, where God announces that in the coming era the proverb about fathers eating sour grapes and children's teeth being set on edge will no longer apply; each person will answer for his own iniquity. Because God is now forming a spiritual house rather than a physical nation, entry into that house depends on repentance and the reception of His Spirit, which can remove the encumbrances that formerly disqualified a person. Consequently, neither parent nor child is barred from eternal life or a place in God's Family by the sins of the other. This change directly affects the question of Gentile inclusion. The material links the principle to Acts 15, where the issue is whether Gentiles must keep the whole law to be saved. Paul's preaching demonstrates that justification comes by faith apart from the deeds of the law, yet faith establishes rather than voids the law. The civil and ceremonial laws that once regulated a physical nation no longer apply in their literal form, because the church is not a territorial government, but the spiritual law remains as the guide for character. Thus the restriction that once limited the congregation of Israel is lifted, and all who repent and believe, whether Jew or Gentile, may enter the spiritual Israel of God.