Notes On Obligatory Prayers And Ablutions compiled by Research Department of the Universal House of Justice in a letter to an individual fm the House of Justice 15 April 1987 As Appeared In Baha'i Studies Bulletin Vol. 4:3-4 2 January 1991
Concerning the obligatory prayers; they are three in number, but the believer is free to choose anyone of them. The long prayer should be recited once every 24 hours; the middle one three times a day: at morning, mid-day, and evening; while the short one, consisting of only one verse, should be recited once a day at noon. All these three prayers should be read with the believer facing the Shrine of Bahá’u’lláh at Bahji, 'Akka, which is also called the Dawning point of Revelation.
(11 November 1936 on behalf of Shoghi Effendi to an individual)