For the LORD has chosen Jacob to be His own, Israel to be His treasured possession. Psalm 135:4
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Then those who feared the LORD spoke with one another. The LORD paid attention and heard them, and a book of remembrance was written before him of those who feared the LORD and esteemed his name. “They shall be mine, says the LORD of hosts, in the day when I make up my treasured possession, and I will spare them as a man spares his son who serves him. Then once more you shall see the distinction between the righteous and the wicked, between one who serves God and one who does not serve him. Malachi 3:16-18
But you are a chosen race, a royal priesthood, a holy nation, a people for his own possession, that you may proclaim the excellencies of him who called you out of darkness into his marvelous light. Once you were not a people, but now you are God’s people; once you had not received mercy, but now you have received mercy. Beloved, I urge you as sojourners and exiles to abstain from the passions of the flesh, which wage war against your soul. Keep your conduct among the Gentiles honorable, so that when they speak against you as evildoers, they may see your good deeds and glorify God on the day of visitation. 1 Peter 2:9-12
For the grace of God has appeared, bringing salvation for all people, training us to renounce ungodliness and worldly passions, and to live self-controlled, upright, and godly lives in the present age, waiting for our blessed hope, the appearing of the glory of our great God and Savior Jesus Christ, who gave himself for us to redeem us from all lawlessness and to purify for himself a people for his own possession who are zealous for good works. Declare these things; exhort and rebuke with all authority. Let no one disregard you. Titus 2:11-15
Also see Romans 11:13-32.