"Naught else besides Him can ever profit you, no, not though ye produce from first to last the testimonies of all those who were before you.”

 

"A few believed in Him; few of Our servants are the thankful. These He admonished, in all His Tablets—nay, in every passage of His wondrous writings—not to give themselves up in the Day of the promised Revelation to anything whatever, be it in the heaven or in the earth. “O people!” said He, “I have revealed Myself for His Manifestation, and have caused My Book, the Bayán, to descend upon you for no other purpose except to establish the truth of His Cause. Fear ye God, and contend not with Him as the people of the Qur’án have contended with Me. At whatever time ye hear of Him, hasten ye towards Him, and cleave ye to whatsoever He may reveal unto you. Naught else besides Him can ever profit you, no, not though ye produce from first to last the testimonies of all those who were before you.”

(Gleanings from the Writings of Bahá’u’lláh, LXXVI, part 4)
www.bahai.org/r/192271322