Abu Ishaq al-Sabay'ai' أبو إسحاق السبيعي عمرو بن عبد الله · The Book on Fasting

"We were with Ammar bin Yasir when a roasted sheep was brought and he said: 'Eat.' Someone among the people said: 'I am fasting.' So Ammar said: 'Whoever fasts on a day in which there is doubt, then he has disobeyed Abul-Qasim (pbuh)."

"The Messenger of Allah would fondle me while he was fasting, and he had the most control among you of his limb (li irbihi)."

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

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