Musnad Ahmad 30:2497

Yahya narrated to us, Ibn ‘Ajlan narrated to us, Wahb ibn Kaysan narrated to me, he said: My father passed by Abu Hurayrah, and he said: "Where are you heading?" He said: "To some sheep of mine." He said: "Yes, wipe their nasal discharge, make their resting place clean, and pray in the corner of their resting place, for they are among the beasts of Paradise. And keep them, for I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: 'It is a land with little rain.'" He said: Meaning Medina.