"The Messenger of Allah went out to Makkah, and he fasted until he came to 'Usfan. Then he called for a cup and drank." (One of the narrators) Shubah said: "(That was) in Ramadan. Ibn 'Abbas used to say: 'Whoever wants to fast, may fast, and whoever wants to break may break his fast."' (Using translation from Nasāʾī 2290)  

خَرَجَ رَسُولُ اللهِ ﷺ إِلَى مَكَّةَ «فَصَامَ حَتَّى أَتَى عُسْفَانَ فَدَعَا بِقَدَحٍ فَشَرِبَ» قَالَ شُعْبَةُ فِي رَمَضَانَ فَكَانَ ابْنُ عَبَّاسٍ يَقُولُ مَنْ شَاءَ صَامَ وَمَنْ شَاءَ أَفْطَرَ  

"The Messenger of Allah traveled during Ramadan and fasted until he reached 'Usfan. Then he called for a vessel and drank during the day when the prople could see him, then he did not fast." (Using translation from Nasāʾī 2291)  

«سَافَرَ رَسُولُ اللهِ ﷺ فِي رَمَضَانَ فَصَامَ حَتَّى بَلَغَ عُسْفَانَ ثُمَّ دَعَا بِإِنَاءٍ فَشَرِبَ نَهَارًا يَرَاهُ النَّاسُ ثُمَّ أَفْطَرَ»  

"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)   

«كَانَ رَسُولُ اللهِ ﷺ يَصُومُ فِيهِ وَيُفْطِرُ»  

That the Messenger of Allah fasted during Ramadan and broke his fast when traveling. (Using translation from Nasāʾī 2293)  

أَنَّ رَسُولَ اللهِ ﷺ «صَامَ فِي شَهْرِ رَمَضَانَ وَأَفْطَرَ فِي السَّفَرِ»