Sahih Bukhari, Chapter: Manumission of Slaves

I have loved the people of the tribe of Bani Tamim ever since I heard, three things, Allah's Apostle (SAW) said about them. I heard him saying, These people (of the tribe of Bani Tamim) would stand firm against Ad-Dajjal." When the Sadaqat (gifts of charity) from that tribe came, Allah's Apostle (SAW) said, "These are the Sadaqat (i.e. charitable gifts) of our folk." Aisha had a slave-girl from that tribe, and the Prophet (SAW) said to Aisha, "Manumit her as she is a descendant of Ishmail (Ishmael [AS])."