Sayyiduna Abdullah bin Abi Awfa (may Allah be pleased with them both) narrates that we were on a journey, and there was no water available. Then suddenly we found water. The people began to give water to the Noble Prophet (peace and blessings be upon him). Whenever they brought water to him, he (peace and blessings be upon him) would say: "The one who serves water to the people drinks last." He repeated this statement three times, until all the people had drunk water, and then at the end, he (peace and blessings be upon him) drank.
Hadith Referenceالفتح الربانی / كتاب الاشربة / 7451
Benefits: … It is understood that the one who gives water to others will first give everyone else to drink, and then in the end, he will drink himself.