'Born again' in the Bible

Jesus answered him, "Truly, truly, I say to you, unless one is born again, he cannot see the kingdom of God."

Do not marvel that I said to you, 'You must be born again.'

Blessed be to the God and Father of our Lord Jesus Christ! In his great mercy he has caused us to be born again into a living hope through the resurrection of Jesus Christ from the dead,

For you have been born again, not of perishable seed, but of imperishable, through the living and enduring word of God.