Abdah bin Sulaiman al-Klabi عبدة بن سليمان الكلابي أبو محمد الكوفي · The Book of Fasting

"The Messenger of Allah used to fast until we said: 'He will not fast.' And he used to fast Shaban, or most of Shaban."' '

"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."