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

And from him, from Ibn Abi Umayr, from Jamil ibn Darraj, from Zurarah, from Abu Ja’far عليه السلام, peace be upon him, who said: Imam عليه السلام said: “Shortening (the prayer) is in one barid, and one barid is four farsakhs.”