Chapter on Ruling of the Traveller and the Sick Person Regarding Fasting

As for what Ali ibn al-Hasan ibn Faddal narrated from Jafar ibn Muhammad ibn Abi al-Sabbah, from Ibrahim ibn Abd al-Hamid, from Abu al-Hasan عليه السلام, peace be upon him, who said: I (narrator) asked Imam عليه السلام about ‘a man who makes a fast of a specified day binding upon himself for Allah سبحانه وتعالى.’ Imam عليه السلام said: “He fasts it always, while present and while travelling.”