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

December 19

…were the signs of the Manifestation of God in every age to appear in the visible realm in accordance with the text of established traditions, none could possibly deny or turn away, nor would the blessed be distinguished from the miserable, and the transgressor from the God-fearing. 
(Baha'u'llah, The Kitab-i-Iqan)