October 14

Embosomed in these lovely and verdant surroundings stands in all its exquisite beauty the mausoleum of the Báb, the shell designed to preserve and adorn the original structure raised by ‘Abdu’l-Bahá as the tomb of the Martyr-Herald of our Faith. Within this shell is enshrined that Pearl of Great Price, the holy of holies, those chambers which constitute the tomb itself, and which were constructed by ‘Abdu’l-Bahá. Within the heart of this holy of holies is the tabernacle, the vault wherein reposes the most holy casket. Within this vault rests the alabaster sarcophagus in which is deposited that inestimable jewel, the Báb’s holy dust. So precious is this dust that the very earth surrounding the edifice enshrining this dust has been extolled by the Center of Bahá’u’lláh’s Covenant, in one of His Tablets in which He named the five doors belonging to the six chambers which He originally erected after five of the believers associated with the construction of the Shrine, as being endowed with such potency as to have inspired Him in bestowing these names, whilst the tomb itself housing this dust He acclaimed as the spot round which the Concourse on high circle in adoration. 
(Shoghi Effendi, from a letter dated March 29, 1951; ‘Citadel of Faith’)