(57) باب مَا جَاءَ فِي سَرْدِ الصَّوْمِ
Jafar bin Humaid narrated that:
Anas bin Malik was asked about the Prophet's fasting and he said: "He would fast during a month until we thought that he did not want to abstain from fasting during any of it. And, he would not fast during a month until we thought that he did not want to fast during any of it. (There was no time) that I wanted to see if he was performing Salat during the night, except that I would see him praying, nor to see him sleeping, except that I would see him sleeping."
Reference: Jami` at-Tirmidhi 769
In-book reference: Book 8, Hadith 88
English translation: Vol. 2, Book 3, Hadith 769