It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that whenever the Messenger of Allah (peace and blessings be upon him) gave (someone) water to drink, he would say: "Start with the elder," or he said: "Start with the elders."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Khalid al-Hadhdha' except Ibn al-Mubarak, and no one narrated it from Ibn al-Mubarak except al-Walid bin Muslim and Ibn Sahm."
Hadith Referenceالمعجم الأوسط / باب العين / 3786
Hadith Takhrij«أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 353، وأبو يعلى فى «مسنده» برقم: 2425»