It was narrated from Hamzah bin 'Amr that he said to the Messenger of Allah:
"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."
Reference: Sunan an-Nasa'i 2303 In-book : Book 22, Hadith 214 English translation : Vol. 3, Book 22, Hadith 2305
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