Abdur Rahman bin Mahdi عبد الرحمن بن مهدي · The Book on Fasting

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."

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