al-Hakam bin 'Utayba الحكم بن عتيبة · The Book of Fasting

"For every good deed that the son of Adam does, he will have (the reward of) ten the like thereof, except for fasting. It is for Me and I shall reward for it.

"Raja bin Haiwah narrated that Abu Umamah said: 'I came to the Messenger of Allah and said: Tel l me of something that I may take (learn) from you. He said: "Take to fasting, for there is nothing like it."' '

"Abu Umamah Al-Bahili narrated to me: 'I said: O Messenger of Allah, tell me of something by which Allah will benefic me. He said: Take to fasting, for there is nothing like it."'

"Which deed is best?" he said: "Take to fasting, for there is nothing equal to it."

"I went out with Abu Qilabah on a journey and he brought some food. I said: 'I am fasting.' He said: 'The Messenger of Allah went out on a journey and brought some food, and said to a man: Come and eat. He said: I am fasting. He said: Allah has waived for the traveler half of the prayer and fasting when traveling, so come and eat. So I came close and ate."'

"We were with the Messenger of Allah on a journey, and some of us were fasting and some of us were not. We made a stop on a hot day and looked for shade. Those who were fasting fell to the ground, but those who were not fasting got up and watered the animals. The Messenger of Allah said: 'Those who were not fasting today have taken the reward.""

"It is said that fasting while traveling is like not fasting while a resident." (Daif)

"The Messenger of Allah commanded us to fast the three days of Al-Bid, the thirteenth, fourteenth and fifteenth."