1 Peter 2:9-10, NIV: But you are a chosen people, a royal priesthood, a holy nation, a people belonging to God, that you may declare the praises of him who called you out of darkness into his wonderful light. Once you were not a people, but now you are the people of God; once you had not received mercy, but now you have received mercy.
1 Corinthians 1:9, NIV: God, who has called you into fellowship with his Son Jesus Christ our Lord, is faithful.
2 Corinthians 6:14-18, NIV: Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? What harmony is there between Christ and Belial? What does a believer have in common with an unbeliever? What agreement is there between the temple of God and idols? For we are the temple of the living God. As God has said: “I will live with them and walk among them, and I will be their God, and they will be my people.” “Therefore come out from them and be separate, says the Lord. Touch no unclean thing, and I will receive you.” “I will be a Father to you, and you will be my sons and daughters, says the Lord Almighty.”
2 Corinthians 13:14, NIV: May the grace of the Lord Jesus Christ, and the love of God, and the fellowship of the Holy Spirit be with you all.
Isaiah 28:16, NIV: So this is what the Sovereign Lord says: “See, I lay a stone in Zion, a tested stone, a precious cornerstone for a sure foundation; the one who trusts will never be dismayed.