رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 772
The Book About the Etiquette of Eating
Excellence of the Cupbearer Drinking Last
عَنْ أبى قَتَادَةَ رضى اللَّه عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ قَالَ: سَاقِيَ الْقَوْمِ آخِرُهُمْ شُرْبًا . ((رَوَاهُ التِّرْمِذِيّ))
Abu Qatadah (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said, "He who serves others with drinking water should be the last to drink himself." [At-Tirmidhi].
Riyad as-Salihin, 772