Sufyan bin Sa‘id Ath-Thawri سفيان الثوري · The Book on Fasting

the Prophet said: "When one of you breaks his fast, then let him do so with dried dates. And whoever does not find dates, then water, for it is purifying."

the Messenger of Allah said: "The people will remain upon goodness as long as they hasten to break the fast."

the Messenger of Allah said: "Whoever breaks the fast during Ramadan without an allowance or illness, then if he fasted for all time, his fasting would not make up for it."

"I saw the Prophet - (a number of times) such that I was not able to count - using the Siwak while he was fasting."

"The Messenger of Allah came to me saying, 'Do you have anything for breakfast?' I said: 'No.' Then he said: 'I am fasting.'" She said: "One day he came to me and I said: 'O Messenger of Allah; I have received a gift for us.' He said: 'What is it?'" She said: "I said 'Hais' He said: 'I began the day fasting'" She said: "Then he ate."

"I did not see the Prophet fasting two consecutive months except for Sha'ban and Ramadan."

"The Messenger of Allah would fast Saturdays, Sundays, and Mondays in one months, and Tuesdays, Wednesdays and Thursdays in the next month."

"The Prophet would awaken his family during the last ten (nights) of Ramadan."

The Prophet said: "Fasting during the winter is an easy reward."