Abu Dawud Book 8, Hadith Number 2614.

Narated By Abbad ibn Shurahbil : I suffered from drought; so I entered a garden of Medina, and rubbed an ear-corn. I ate and carried in my garment. Then its master came, he beat me and took my garment. He came to the Apostle of Allah (PBUH) who said to him: You did not teach him if he was ignorant; and you did not feed him if he was hungry. He ordered him, so he returned my garment to me, and gave me one or half a wasq (sixty or thirty sa’s) of corn.