From him, from Muhammad ibn Isa al-‘Ubaydi, from Sulayman ibn Hafs al-Marwazi, who said: The jurist (faqih) of ‘Askar (Imam al-Hadi عليه السلام), peace be upon him, said: “It is obligatory upon the traveller to say at the end of every prayer in which he shortens: ‘Subhana Allah, wal-hamdu lillah, wa la ilaha illa Allah, wallahu akbar’ , thirty times to complete the prayer.”