Ali ibn Mahziyar from al-Hasan ibn Ali from Fadalah from Muawiyah ibn Ammar. He said: Abu Abdillah عليه السلام, peace be upon him, said to me (Ibn Ammar): “Make up what you missed of the daytime prayer during the day, and what you missed of the night prayer during the night.” I asked: “Should I make up two witr prayers in one night?” Imam عليه السلام said: “Yes, always make up the witr prayer.”