Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai:2292 – Ḥumayd b. Masʿadah > Sufyān > al-ʿAwwām b. Ḥawshab

"I said to Mujahid: 'What about fasting while traveling?' He said: 'The Messenger of Allah used to fast (sometimes) and not fast (sometimes)."'  

النسائي:٢٢٩٢ – أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ قَالَ حَدَّثَنَا سُفْيَانُ عَنِ الْعَوَّامِ بْنِ حَوْشَبٍ قَالَ قُلْتُ لِمُجَاهِدٍ الصَّوْمُ فِي السَّفَرِ قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ يَصُومُ وَيُفْطِرُ  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:2612 – Ḥumayd b. Masʿadah > Sufyān > al-ʿAwwām b. Ḥawshab

"I said to Mujahid: 'What about fasting while traveling?' He said: 'The Messenger of Allah used to fast (sometimes) and not fast (sometimes)."' (Using translation from Nasāʾī 2292)   

الكبرى للنسائي:٢٦١٢ – أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ قَالَ حَدَّثَنَا سُفْيَانُ عَنِ الْعَوَّامِ بْنِ حَوْشَبٍ قَالَ قُلْتُ لِمُجَاهِدٍ الصَّوْمُ فِي السَّفَرِ؟ قَالَ

«كَانَ رَسُولُ اللهِ ﷺ يَصُومُ فِيهِ وَيُفْطِرُ»