Musnad Ahmad 534:5

Hammad ibn Khalid narrated to us, from Mu'awiyah ibn Salih, from Ibn 'Abdullah ibn Busr, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) came to us, and my grandmother presented him with dates that she had prepared for him. She cooked for him, and we gave them something to drink. The cup ran out, so I brought another cup, and I was the one serving. The Messenger of Allah (peace and blessings of Allah be upon him) said: "Give the cup to the one who reached it [first]."