Hamzah bin Amr Al-Aslami asked the Messenger of Allah about fasting while traveling, and he fasted regularly. So the Messenger of Allah said: 'If you wish then fast, and if you wish then break (the fast).'"
Jami` at-Tirmidhi Book 8, Hadith 30
← Previous Hadith "The Messenger of Allah went to Makkah in the Year of the Conquest, so he fasted until he reached Kura Al-Ghamim and the people were fasting with him. Then it was said to him: 'The fast has become difficult for the people, and they are watching you to see what you will do.' So after Asr, he called for a cup of water and drank it while the people were looking at him. Some of them broke the fast while some of them continued their fasting. It was conveyed to him that people were still fasting, so he said: "Those are the disobedient.'"

Jami` at-Tirmidhi Book 8, Hadith 29 Next Hadith → "We were on a journey with the Messenger of Allah during the month of Ramadan. No one objected to the fast of the one fasting nor the fast breaking of the one who broke his fast."

Jami` at-Tirmidhi Book 8, Hadith 31