Regeneration

But as many as received him, to them gave he the right to become children of God, even to them that believe on his name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God. - John 1:12-13

Jesus answered and said unto him, Verily, verily, I say unto thee, Except one be born anew, he cannot see the kingdom of God. Marvel not that I said unto thee, Ye must be born anew. The wind bloweth where it will, and thou hearest the voice thereof, but knowest not whence it cometh, and whither it goeth: so is every one that is born of the Spirit. - John 3:3, 7-8

Wherefore we faint not; but though our outward man is decaying, yet our inward man is renewed day by day. - 2 Corinthians 4:16

Wherefore if any man is in Christ, he is a new creature: the old things are passed away; behold, they are become new. - 2 Corinthians 5:17

And you did he make alive, when ye were dead through your trespasses and sins, wherein ye once walked according to the course of this world, according to the prince of the powers of the air, of the spirit that now worketh in the sons of disobedience; among whom we also all once lived in the lust of our flesh, doing the desires of the flesh and of the mind, and were by nature children of wrath, even as the rest: but God, being rich in mercy, for his great love wherewith he loved us, even when we were dead through our trespasses, made us alive together with Christ (by grace have ye been saved), and raised us up with him, and made us to sit with him in the heavenly places, in Christ Jesus. (Ephesians 2:1-6)

But when the kindness of God our Savior, and his love toward man, appeared, not by works done in righteousness, which we did ourselves, but according to his mercy he saved us, through the washing of regeneration and renewing of the Holy Spirit, which he poured out upon us richly, through Jesus Christ our Savior; that, being justified by his grace, we might be made heirs according to the hope of eternal life. (Titus 3:3-7)

Seeing ye have purified your souls in your obedience to the truth unto unfeigned love of the brethren, love one another from the heart fervently: having been begotten again, not of corruptible seed, but of incorruptible, through the word of God, which liveth and abideth. - 1 Peter 1:22-23