Bahá'u'lláh mentioned in the Kitáb-i-Íqán that God will renew the "City of God" about every thousand years, and specifically mentioned that a new Manifestation of God would not appear within 1000 years (1893-2893) of Bahá'u'lláh's message, but that the authority of Bahá'u'lláh's message could last up to 500,000 years.
Bahá'u'lláh spominje u Kitáb-i-Íqánu da će Bog obnoviti "Grad Božji" svakih tisuću godina i posebno napominje da se nova Božja pokazanja (dolazak Mesije) neće dogoditi sljedećih 1.000 godina (1893.-2893.) prema Bahá 'u'lláh-u, ali da autoritet Bahá'u'lláh poruke može trajati i do 500.000 godina.