Bahá’u’lláh recalls those painful days during His retirement

At times His dwelling-place was a cave to which He refers in His Tablets addressed to the famous Shaykh ‘Abdu’r-Rahmán and to Maryam, a kinswoman of His. “I roamed the wilderness of resignation” He thus depicts, in the Lawh-i-Maryam, the rigors of His austere solitude, “traveling in such wise that in My exile every eye wept sore over Me, and all created things shed tears of blood because of My anguish. The birds of the air were My companions and the beasts of the field My associates.” “From My eyes,” He, referring in the Kitáb-i-Íqán to those days, testifies, “there rained tears of anguish, and in My bleeding heart surged an ocean of agonizing pain. Many a night I had no food for sustenance, and many a day My body found no rest.… Alone I communed with My spirit, oblivious of the world and all that is therein.” 

- Shoghi Effendi (‘God Passes By’, chapter 7)

Bahá’u’lláh retired to the wilderness of Kurdistán, attired “in the garb of a traveler, coarsely clad, taking with Him nothing but his kashkúl (alms-bowl) and a change of clothes”

Attired in the garb of a traveler, coarsely clad, taking with Him nothing but his kashkúl (alms-bowl) and a change of clothes, and assuming the name of Darvísh Muḥammad, Bahá’u’lláh retired to the wilderness, and lived for a time on a mountain named Sar-Galú, so far removed from human habitations that only twice a year, at seed sowing and harvest time, it was visited by the peasants of that region. Alone and undisturbed, He passed a considerable part of His retirement on the top of that mountain in a rude structure, made of stone, which served those peasants as a shelter against the extremities of the weather. 

- Shoghi Effendi (‘God Passes By’, chapter 7)

April 10, 1854: Bahá’u’lláh suddenly left the city of Baghdad “without informing any one even among the members of His own family”

Suddenly, and without informing any one even among the members of His own family, on the 12th of Rajab 1270 A.H. (April 10, 1854), He departed, accompanied by an attendant, a Muhammadan named Abu’l-Qásim-i-Hamadání, to whom He gave a sum of money, instructing him to act as a merchant and use it for his own purposes. Shortly after, that servant was attacked by thieves and killed, and Bahá’u’lláh was left entirely alone in His wanderings through the wastes of Kurdistán, a region whose sturdy and warlike people were known for their age-long hostility to the Persians, whom they regarded as seceders from the Faith of Islám, and from whom they differed in their outlook, race and language. 

- Shoghi Effendi (‘God Passes By’, chapter 7)