Chapter on the Detailed Explanation of Prayer, Including the Obligatory and Recommended, and What is Permissible and Not Permissible.

Ali ibn Mahziyar, from al-Hasan, from Ibn Abi ‘Umayr, from ‘Umar ibn Udhaynah, from Zurarah, from al-Fudayl, who said: I heard Abu Ja’far عليه السلام say: "You make it up during the day as ‘witr’ as long as the sun has not passed its zenith (before Dhuhr). But once the sun has passed its zenith, then it is (made up) as pairs, two by two."