(We travelled with the Messenger of Allah (PBUH) during the month of Ramadan, but neither the observer of the fast found fault with the breaker of the fast, nor the breaker of the fast found fault with the observer of the fast.)

[Muslim]

The companions had very exalted manners. In one of the expedition (Ghazwah), some of them observed Siyaam taking with the official ruling and others broke their Siyaam taking with the permit to break it in travels. Those who observed Siyaam did not find fault with those who broke their Siyaam, and vice versa. This is how exalted morals should be manifested. 

(Anas (may Allah be pleased with him) reported: We were with the Apostle of Allah (may peace be upon him) on a journey. Some of us had been observing the fast and some of us had not been fasting. We got down at a place on a hot day. Most of us had the cloth for shelter. There were also those amongst us who sheltered (themselves against the rays of the) sun with the help of their hands. The observers of the fast fell down (on account of weakness). Those who had not observed it got up and pitched tents and watered the mounts. Thereupon the Messenger of Allah (may peace be upon him) said: The breakers of the fast have taken away the reward today.)

[Muslim, on the authority of Anas]