Musnad Ahmad 1202:1

Waki’ narrated to us, al-A’mash narrated to us, from Abu Ishaq, from ‘Abd al-Rahman ibn Zayd al-Fa’ishi, from a daughter of Khabbab, who said: Khabbab went out on a military expedition. The Prophet, peace and blessings of Allah be upon him, used to look after us, to the point that he would milk a goat for us. She said: He would milk it until it overflowed or spilled over. When Khabbab returned, he milked it, and its yield returned to what it had been. We said to him: The Messenger of Allah, peace and blessings of Allah be upon him, used to milk it until it overflowed—and he said once: until it became full—but when I milked it, its yield returned [to its previous state].