From him, from Ali ibn Khalid, from Ahmad ibn Al-Hasan ibn Ali ibn Faddal, from Amr ibn Sa'id Al-Mada'ini, from Musaddiq ibn Sadaqah, from Ammar ibn Musa Al-Sabati, from Abu Abdillah عليه السلام, peace be upon him, who said: I asked Imam عليه السلام about a man who prays two rak'ahs of the Witr and forgets the third until morning comes. Imam عليه السلام said: "He should perform the Witr when he wakes up with one rak'ah immediately."