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
suyuti:291-13b –
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السيوطي:٢٩١-١٣b –

"سأَلْتُ رَسُولَ اللهِ ﷺ عَنِ الصِّيَامِ فِى السَّفَرِ فَقَالَ: أَىّ ذَلِكَ أَيْسَرُ عَلَيْكَ فَافْعَلْ".  

[طب] الطبرانى في الكبير وأبو نعيم عن حمزة بن عمرو الأسلمى

See similar narrations below:

Collected by Ṭabarānī
tabarani:2988 – Abū al-Zinbāʿ Rawḥ b. al-Faraj > Yaḥyá b. Bukayr > Ibn Lahīʿah > Yazīd b. Abū Ḥabīb > ʿImrān b. Abū Anas > Abū Salamah > Ḥamzah b. ʿAmr al-Aslamī

[Machine] He asked the Messenger of Allah ﷺ about fasting while traveling, and he said, "Whichever is easier for you, do it."  

الطبراني:٢٩٨٨ – حَدَّثَنَا أَبُو الزِّنْبَاعِ رَوْحُ بْنُ الْفَرَجِ ثنا يَحْيَى بْنُ بُكَيْرٍ حَدَّثَنَا ابْنُ لَهِيعَةَ عَنْ يَزِيدَ بْنِ أَبِي حَبِيبٍ عَنْ عِمْرَانَ بْنِ أَبِي أَنَسٍ عَنْ أَبِي سَلَمَةَ عَنْ حَمْزَةَ بْنِ عَمْرٍو الْأَسْلَمِيِّ

أَنَّهُ سَأَلَ رَسُولَ اللهِ ﷺ عَنِ الصِّيَامِ فِي السَّفَرِ فَقَالَ «أَيُّ ذَلِكَ أَيْسَرُ عَلَيْكَ فَافْعَلْ»