The Prophet (ﷺ) left Medina for Mecca till he reached 'Usfan, He then called for a vessel (of water). It was raised to his mouth to show it to the people, and that was in Ramadan. Ibn 'Abbas used to say: The Prophet (ﷺ) fasted and he broke his fast. He who likes may fast and he who likes may break.
Sunan Abi Dawud Book 14, Hadith 92
← Previous Hadith I said: Messenger of Allah. I am a master of mounts and I use them ! I myself travel on them and I rent them. This month, that is, Ramadan, happend to come to me (while I am on a journey), and I find myself strong enough (to fast) as I am young, and I find that it is easier for me to fast than to postpone it, and i becomes debt due from me. Does it bring me more reward, Messenger of Allah, if I fast, or if I break ? He replied: Whichever you like, Hamzah.

Sunan Abi Dawud Book 14, Hadith 91 Next Hadith → We travelled along with the Prophet (ﷺ) during Ramadan. Some of us were fasting and other broke their fast. Those who fasted did not find fault with those who broke, and those who broke their fast did not find fault with those who fasted.

Sunan Abi Dawud Book 14, Hadith 93