The Kitáb-i-Aqdas - The Most Holy Book
Index term: Sun as symbol for
k6.
n3, n4, n5, n6, n7, n8
We have enjoined obligatory prayer upon you, with nine rak'ahs, to be offered at noon and in the morning and the evening unto God, the Revealer of Verses. We have relieved you of a greater number, as a command in the Book of God. He, verily, is the Ordainer, the Omnipotent, the Unrestrained. When ye desire to perform this prayer, turn ye towards the Court of My Most Holy Presence, this Hallowed Spot that God hath made the Centre round which circle the Concourse on High, and which He hath decreed to be the Point of Adoration for the denizens of the Cities of Eternity, and the Source of Command unto all that are in heaven and on earth; and when the Sun of Truth and Utterance shall set, turn your faces towards the Spot that We have ordained for you. He, verily, is Almighty and Omniscient.
k7.
Everything that is hath come to be through His irresistible decree. Whenever My laws appear like the sun in the heaven of Mine utterance, they must be faithfully obeyed by all, though My decree be such as to cause the heaven of every religion to be cleft asunder. He doeth what He pleaseth. He chooseth, and none may question His choice. Whatsoever He, the Well-Beloved, ordaineth, the same is, verily, beloved. To this He Who is the Lord of all creation beareth Me witness. Whoso hath inhaled the sweet fragrance of the All-Merciful, and recognized the Source of this utterance, will welcome with his own eyes the shafts of the enemy, that he may establish the truth of the laws of God amongst men. Well is it with him that hath turned thereunto, and apprehended the meaning of His decisive decree.
k41.
Amongst the people is he whose learning hath made him proud, and who hath been debarred thereby from recognizing My Name, the Self-Subsisting; who, when he heareth the tread of sandals following behind him, waxeth greater in his own esteem than Nimrod. Say: O rejected one! Where now is his abode? By God, it is the nethermost fire. Say: O concourse of divines! Hear ye not the shrill voice of My Most Exalted Pen? See ye not this Sun that shineth in refulgent splendour above the All-Glorious Horizon? For how long will ye worship the idols of your evil passions? Forsake your vain imaginings, and turn yourselves unto God, your Everlasting Lord.
k53.
Should differences arise amongst you over any matter, refer it to God while the Sun still shineth above the horizon of this Heaven and, when it hath set, refer ye to whatsoever hath been sent down by Him. This, verily, is sufficient unto the peoples of the world. Say: Let not your hearts be perturbed, O people, when the glory of My Presence is withdrawn, and the ocean of My utterance is stilled. In My presence amongst you there is a wisdom, and in My absence there is yet another, inscrutable to all but God, the Incomparable, the All-Knowing. Verily, We behold you from Our realm of glory, and shall aid whosoever will arise for the triumph of Our Cause with the hosts of the Concourse on high and a company of Our favoured angels.
k108.
To none is it permitted to mutter sacred verses before the public gaze as he walketh in the street or marketplace; nay rather, if he wish to magnify the Lord, it behoveth him to do so in such places as have been erected for this purpose, or in his own home. This is more in keeping with sincerity and godliness. Thus hath the sun of Our commandment shone forth above the horizon of Our utterance. Blessed, then, be those who do Our bidding.
n8.
and when the Sun of Truth and Utterance shall set, turn your faces towards the Spot that We have ordained for you
Bahá'u'lláh ordains His resting-place as the Qiblih after His passing. The Most Holy Tomb is at Bahjí, 'Akká. 'Abdu'l-Bahá describes that Spot as the "luminous Shrine", "the place around which circumambulate the Concourse on High".
In a letter written on his behalf, Shoghi Effendi uses the analogy of the plant turning in the direction of the sun to explain the spiritual significance of turning towards the Qiblih:

. . . just as the plant stretches out to the sunlight -- from which it receives life and growth -- so we turn our hearts to the Manifestation of God, Bahá'u'lláh, when we pray; . . . we turn our faces . . . to where His dust lies on this earth as a symbol of the inner act.