Prayer and Fasting for a Prisoner Moved Against His Will - Jurisprudential Answers - Miscellaneous Issues, Vol 3

Ahmed al-Hasan Response:

As for the prisoner's prayer and fasting, he performs his prayer in full and observes the obligatory fast in every situation so long as he does not know how long he will remain in prison. If he knows his situation, he acts accordingly. If he will remain in prison for fewer than ten days and the prison is a travel distance away from his place of residence or home, he shortens the prayer and does not fast. If he will remain for ten days or more, he performs the prayer in full and fasts. Merely being transferred from one prison to another does not change anything.