Sunan At-Tirmidhi

Narrated 'Abdullah bin Rafi':""I said to Abu Hurairah: 'Why were you given the Kunyah Abu Hurairah?' He said: 'Do you not fear me?'"" He said: ""Indeed, I am in awe of you.' He said: 'I used to tend the sheep of my people, and I had a small kitten; so I used to place it in a tree at night, and during the day I would take it with me and play with it. So they named me Abu Hurairah