Mishkat al-Masabih #1928
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: إِنَّ حَمْزَةَ بْنَ عَمْرٍو الْأَسْلَمِيَّ قَالَ لِلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَصُومُ فِي السَّفَرِ وَكَانَ كَثِيرَ الصِّيَامِ. فَقَالَ: «إِنْ شِئْتَ فَصم وَإِن شِئْت فَأفْطر»
‘A'isha said that Hamza b. ‘Amr al-Aslami who was greatly devoted to fasting asked the Prophet whether he should fast when on a journey, and received the reply, “Fast if you like, or break your fast if you like.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #1928 from Mishkat al-Masabih, in the Book of Fasting.