Sahih Bukhari, Chapter: Manumission of Slaves

On my way to the Prophet (SAW) I was reciting: 'What a long tedious tiresome night! Nevertheless, it has saved us From the land of Kufr (disbelief).' I had a slave who ran away from me on the way. When I went to the Prophet (SAW) and gave the pledge of allegiance for embracing Islam, the slave showed up while I was still with the Prophet (SAW) who remarked, "O Abu Huraira! Here is your slave!" I said, "I manumit him for Allah's Sake," and so I freed him.