Muhammad bin Ibrahim bin al-Harith محمد بن إبراهيم بن الحارث · The Book of Fasting

"The Messenger of Allah said; 'DO not be confused by the Adhan of Bilal, or by this whiteness, until dawn appears like this" - meaning horizontally. (One of the narrators) Abu Dawud said: "And he spread out his hands gesturing to the right and left."

"Do not fast ahead of the month, except for a man who habitually fasts, and that day happenes to be one of his regular fasts." '

"None should fast one or two days ahead of the month except, someone who had a prior habit for fasting, in which case let him fast." '

"I do not know that the Messenger of Allah recited the whole Quran in one night, or prayed Qiyam until morning, or ever fasted an entire month, except Ramadan."

"I asked 'Aishah about the fasting of the Messenger of Allah. She said: "The Messenger of Allah used to fast until we said: He is going to (continue to) fast, and he used not to fast until we said: He is not going to, and he did not fast for a whole month from the time he came to Al-Madinah, apart from Ramadan."'

"The Messenger of Allah said: "The best of fasting is the fast of Dawud, peace be upon him. He used to fast for one day and break his fast for one day."' 'Ata said: "someone who heard him told me that Ibn 'Umar (said) that the Prophet said: 'Whoever fasts every day of his life, then he has not fasted."