Sunan an Nasai 2301
The Book of Fasting
أَخْبَرَنَا عُبَيْدُ اللَّهِ بْنُ سَعْدِ بْنِ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا عَمِّي، قَالَ حَدَّثَنَا أَبِي، عَنِ ابْنِ إِسْحَاقَ، عَنْ عِمْرَانَ بْنِ أَبِي أَنَسٍ، عَنْ حَنْظَلَةَ بْنِ عَلِيٍّ، عَنْ حَمْزَةَ، قَالَ قُلْتُ يَا نَبِيَّ اللَّهِ إِنِّي رَجُلٌ أَسْرُدُ الصِّيَامَ أَفَأَصُومُ فِي السَّفَرِ قَالَ " إِنْ شِئْتَ فَصُمْ وَإِنْ شِئْتَ فَأَفْطِرْ " .
It was narrated that Hamzah said:"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
Grading: Abu Ghuddah: Sahih · Al-Albani: Sahih · Zubair Ali Zai: Hasan
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.