Hisham bin 'Urwa هشام بن عروة · The Book of Fasting

"Whoever spends the night of Ramadan in prayer (Qiyam) out of faith and in the hope of reward, he will be forgiven his previous sins." '

he asked the Messenger of Allah about fasting while traveling. He said: "If you wish to fast then fast, and if you wish not to fast then do not fast."

"I said: 'O Prophet of Allah, I am a man who fasts continually, so should I fast while traveling?' He said: 'If you wish then fast, and if you wish then do not fast."'

"If you wish then fast, and if you wish then fast, and if you wish then do not fast."

"I feel able to fast while traveling; is there any sin on me?" He said: "It is a concession from Allah, the mighty and sublime, so whoever accepts it has done well, and whoever wants to fast, there is no sin on him."

"It was said: 'O Messenger of Allah, so and so never broke his fast, even for one day for the rest of his life.' He said: 'He has neither fasted nor broken his fast."" '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."