The "Suratu'l-Ridvan" is a part of this work

Includes the Khutbiy-i-Dhikriyyih as chapter 1.

A condensed form of the Persian Bayan, written in the language of divine verses. While much shorter in length than the Persian Bayan, the Arabic Bayan contains eleven full unities, whereas the Persian Bayan ends with gate 10 of the ninth unity. The parts of the Arabic Bayan that are not matched by the Persian Bayan (from gate 11 of the ninth unity to the end of the eleventh unity) were written after the Persian Bayan was completed. This work is sometimes assumed to have been written before the Persian Bayan for the simple reason that it seems as if the latter is an elaboration of the former. In reality, however, like the Persian Bayan, most of the Arabic Bayan was written in Makú, although the last sections may have been written in Chihriq.

see also BB00001 Persian Bayan

The Mother Book of the Babi Dispensation. Comprising nine vahids (unities) of nineteen chapters or babs (gates)—with the exception of the last unity, which has only ten gates—the greater part of the work was written in the prison of Makú, but, contrary to some prevalent assumptions, the last parts may have been written in Chihriq, after the Bab was interrogated by the clerics in Tabriz. The Persian Bayan abrogates Islamic laws and traditions and sets down new laws and teachings. However, the various laws are discussed as symbols referring to deep spiritual meanings and vehicles to prepare the people for the advent of Him Whom God shall make manifest. Both the form and content of the book affirm the underlying metaphysics of unity in which all things are manifestations of an inner reality which is the revelation of God within them.

see also BB00020, Arabic Bayan

Shoghi Effendi writes in " God Passes By", p. 26: "The Báb was still in Máh-Kú when He wrote the most detailed and illuminating of His Tablets to Muḥammad Sháh. Prefaced by a laudatory reference to the unity of God, to His Apostles and to the twelve Imáms; unequivocal in its assertion of the divinity of its Author and of the supernatural powers with which His Revelation had been invested; precise in the verses and traditions it cites in confirmation of so audacious a claim; severe in its condemnation of some of the officials and representatives of the Sháh’s administration, particularly of the “wicked and accursed” Ḥusayn Khán; moving in its description of the humiliation and hardships to which its writer had been subjected, this historic document resembles, in many of its features, the Lawḥ-i-Sulṭán, the Tablet addressed, under similar circumstances, from the prison-fortress of ‘Akká by Bahá’u’lláh to Náṣiri’d-Dín Sháh, and constituting His lengthiest epistle to any single sovereign."

Note that the Partial Inventory states that the word count is more than 500,000 words.

Last part is known as the Lawh-i-Hurufat