The Lord added to their group. We commonly use "church" in a specialized sense [Methodist church; Catholic church, etc.]. The ONE CHURCH which Jesus built on the rock foundation of his DIVINITY exists in a locality as a group. It is correct to say that the same reaching out through faith that make you part of Christ, also makes you part of Christ's church (see Acts 2:38). In other words, you do not JOIN the church, salvation makes you a member. Pentecost was the birth-day of the Lord's Church (Acts 1:8; Colossians 1:13; Ephesians 2:19-22).

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Old Testament