Mishkat al-Masabih #1937
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن حَمْزَة بن عَمْرو السّلمِيّ أَنَّهُ قَالَ: يَا رَسُولَ اللَّهِ إِنِّي أَجِدُ بِي قُوَّةً عَلَى الصِّيَامِ فِي السَّفَرِ فَهَلْ عَلَيَّ جُنَاحٌ؟ قَالَ: «هِيَ رُخْصَةٌ مِنَ اللَّهِ عَزَّ وَجَلَّ فَمَنْ أَخَذَ بِهَا فَحَسَنٌ وَمَنْ أَحَبَّ أَنْ يَصُومَ فَلَا جُنَاحَ عَلَيْهِ» . رَوَاهُ مُسلم
Hamza b. ‘Amr al-Aslami told God’s messenger that he found himself strong enough to fast while travelling and asked whether it would be wrong for him to do so. He was told that licence had been given by God who is great and glorious, so that if anyone acted upon this he did well, but if anyone wished to fast he would not be guilty of sin.
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #1937 from Mishkat al-Masabih, in the Book of Fasting.