“Recite ye the verses of God every morn and eventide.” (Bahá’u’lláh, ‘The Kitáb-i-Aqdas’)

December 26

O Chief!  [‘Álí Páshá, the Ottoman Prime Minister] We revealed Ourself unto thee at one time upon Mount Tíná, and at another time upon Mount Zaytá, [1] and yet again in this hallowed Spot. Following, however, thy corrupt inclinations, thou didst fail to respond and wert accounted with the heedless. Consider, then, and call thou to mind the time when Muhammad came with clear tokens from Him Who is the Almighty, the All-Knowing. The people were wont to pelt Him with stones from hidden places and in the markets, and they rejected the signs of God, thy Lord and the Lord of thy forefathers. The learned also denied Him, as did their followers, and likewise the kings of the earth, as thou hast heard from the tales of old. Among those kings was Chosroes, [2] to whom Muhammad sent a blessed epistle summoning him unto God and forbidding him from misbelief. Verily, thy Lord knoweth all things. Following the promptings of his evil and corrupt desires, however, Chosroes waxed arrogant before God and tore up the Tablet. He, verily, is accounted among the inmates of the nethermost fire. 
- Baha’u’llah  (Súriy-i-Ra’ís, addressed to ‘Álí Páshá, the Ottoman Prime Minister, [referred to here as Ra’ís (Chief or Ruler)]; ‘The Summons of the Lord of Hosts’
[1] Literally, “the Mount of Figs” and “the Mount of Olives”, cf. Qur’án 95:1.
[2] Chosroes II, the Sasanian monarch who reigned in Persia during the lifetime of Muhammad