The Kitáb-i-Aqdas - The Most Holy Book
Index term: identified by the Báb as Bahá’u’lláh, under Qiblih
k137.
O people of the Bayán! Fear ye the Most Merciful and consider what He hath revealed in another passage. He said: "The Qiblih is indeed He Whom God will make manifest; whenever He moveth, it moveth, until He shall come to rest." Thus was it set down by the Supreme Ordainer when He desired to make mention of this Most Great Beauty. Meditate on this, O people, and be not of them that wander distraught in the wilderness of error. If ye reject Him at the bidding of your idle fancies, where then is the Qiblih to which ye will turn, O assemblage of the heedless? Ponder ye this verse, and judge equitably before God, that haply ye may glean the pearls of mysteries from the ocean that surgeth in My Name, the All-Glorious, the Most High.
n7.
When ye desire to perform this prayer, turn ye towards the Court of My Most Holy Presence, this Hallowed Spot that God hath . . . decreed to be the Point of Adoration for the denizens of the Cities of Eternity
The “Point of Adoration”, that is, the point to which the worshipper should turn when offering obligatory prayer, is called the Qiblih. The concept of Qiblih has existed in previous religions. Jerusalem in the past had been fixed for this purpose. Muhammad changed the Qiblih to Mecca. The Báb’s instructions in the Arabic Bayán were:

The Qiblih is indeed He Whom God will make manifest; whenever He moveth, it moveth, until He shall come to rest.

This passage is quoted by Bahá’u’lláh in the Kitáb-i-Aqdas (137) and confirmed by Him in the above-noted verse. He has also indicated that facing in the direction of the Qiblih is a “fixed requirement for the recitation of obligatory prayer” (Q&A 14 and 67). However, for other prayers and devotions the individual may face in any direction.