"Even as Jesus said: “Ye must be born again.” ...

... "Even as Jesus said: “Ye must be born again.” 16 Again He saith: “Except a man be born of water and of the Spirit, he cannot enter into the Kingdom of God. That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.” 17 The purport of these words is that whosoever in every dispensation is born of the Spirit and is quickened by the breath of the Manifestation of Holiness, he verily is of those that have attained unto “life” and “resurrection” and have entered into the “paradise” of the love of God. And whosoever is not of them, is condemned to “death” and “deprivation,” to the “fire” of unbelief, and to the “wrath” of God. In all the scriptures, the books and chronicles, the sentence of death, of fire, of blindness, of want of understanding and hearing, hath been pronounced against those whose lips have tasted not the ethereal cup of true knowledge, and whose hearts have been deprived of the grace of the holy Spirit in their day. Even as it hath been previously recorded: “Hearts have they with which they understand not.” 18"

-Bahá'u'lláh, The Kitáb-i-Íqán, pp. 118-119

 16. John 3:7. 
 17. John 3:5–6. 
 18. Qur’án 7:178.