“He it is,” referring to Himself He [Baha’u’llah] further proclaims, “Who in the Old Testament hath been named Jehovah, Who in the Gospel hath been designated as the Spirit of Truth, and in the Qur’án acclaimed as the Great Announcement.” “But for Him no Divine Messenger would have been invested with the robe of prophethood, nor would any of the sacred scriptures have been revealed. To this bear witness all created things.”
(‘The Dispensation of Baha’u’llah; included in ‘The World Order of Baha’u’llah’)