Sahih Bukhari | Volume 7 | Hadith Number 512

Narrated by Al-Bara
The Prophet came from Mecca with Abu Bakr. Abu Bakr said "We passed by a shepherd

and at that time Allah's Apostle was thirsty. I milked a little milk in a bowl and Allah's Apostle drank till I was pleased. Suraqa bin Ju'shum came to us riding a horse (chasing us). The Prophet invoked evil upon him, whereupon Suraqa requested him not to invoke evil upon him, in which case he would go back. The Prophet agreed.