October 1863: Baha'u'llah reveals the Tablet of Subhanika-Ya-Hu, also known as Lawh-i-Naqus (Tablet of the Bell)

Subhanika-Ya-Hu: A beautiful tablet in Arabic and in Bahá'u'lláh's own hand was revealed in Constantinople on the eve of the 5th of Jamadiyu'l-Avval 1280 A.H. (19 October 1863), the anniversary of the Declaration of the Báb.[1] This Tablet, because of its opening verse, is known as Lawh-i-Naqus (Tablet of the Bell) and is also referred to as the Subhanika-Ya-Hu. It was revealed following a request made through 'Abdu'l-Bahá by one of Bahá'u'lláh's companions, Aqa Muhammad-'Ally-i-Tambaku-Furush-i-Isfahani. The revelation of this Tablet on such an auspicious occasion brought immense joy to the hearts of those who were celebrating that historic festival. Bahá'u'lláh opens this Tablet with these words: 

“O Monk of the Incomparable One! Ring out the Bell, inasmuch as the Day of the Lord hath shone forth and the Beauty of the All-Glorious is established upon His holy and resplendent Throne.” 

These few lines give us a glimpse of the majesty and sublimity of the Tablet. Like those revealed near the time of Bahá'u'lláh's declaration, this Tablet pulsates with an indescribable power that can emanate only from the Pen of the Supreme Manifestation of God. Here, the matchless utterances of Bahá'u'lláh, original and profound, are possessed of such beauty and rhythm as no pen can describe. Composed in a style that lends itself to collective chanting, this Tablet creates an atmosphere of ecstasy and joy when chanted by the believers.[2] Revealed soon after His departure from Baghdad, it announces in clear and majestic terms the rising of the Orb of His Revelation, asserts that He[3] who was hidden behind the veils of concealment is now made manifest, extols the potency and glory of His Cause, declares that the Day of God has come, summons the inhabitants of the highest Paradise to prepare themselves and acquire the capacity for attaining the presence of God, bids his lovers rejoice and celebrate the coming of the Well-Beloved, and calls upon all created things to proclaim the glad-tidings of this Revelation to mankind. And finally, He prays for His companions: that they may become detached from everything besides Him, that their hearts may burn with the fire of His love and become pure and without desire. He also prays that His companions, devoted to the promotion of His Cause, may become victorious over all who dwell on earth. 
- Adib Taherzadeh  (The Revelation of Baha'u'llah vol. 2) 

A provisional translation of this Tablet is available at: http://bahai-library.com/lambden_naqus

[1] The Declaration of the Báb was on the evening of 5 Jamadiyu'l-Avval, 1260 A.H. (22 May 1844), but at present in the East, the anniversary of this festival is celebrated according to the lunar calendar.]
[2] Not to be confused with congregational prayer, which (with the exception of the Prayer for the Dead) is forbidden by Bahá'u'lláh. Tablets in the original language are chanted by an individual. Occasionally, when there is a refrain in a Tablet, it has been customary for others to join in the refrain if it is suitable to do so.]
[3] Baha’u’llah