Hadith 772
Abu Qatadah (May Allah be pleased with him) reported:
عن أبى قتادة رضى الله عنه عن النبي صلى الله عليه وسلم قال: " ساقي القوم آخرهم شرباً" . ((رواه الترمذي))
The Messenger of Allah (ﷺ) said, "He who serves others with drinking water should be the last to drink himself." [At-Tirmidhi].
In plain words
The one who pours water for a gathering should drink last himself. Serving others by putting their share before your own.
Reference : Riyad as-Salihin 772 In-book reference : Book 2, Hadith 46