Abu Dawud Book 24, Hadith Number 3942.
Narated By Sulamah bint Ma’qil al-Qasiyyah : My uncle brought me (to Medina) in the pre-Islamic days. He sold me to al-Hubab ibn Amr, brother of AbulYusr ibn Amr. I bore a child, AbdurRahman ibn al-Hubab, to him and he (al-Hubab) then died.
Thereupon his wife said: I swear by Allah, now you will be sold (as a repayment) for his loan.
So I came to the Apostle of Allah (PBUH) and said: Apostle of Allah! I am a woman of Banu Kharijah Qays ibn Aylan. My uncle had brought me to Medina in pre-Islamic days. He sold me to al-Hubab ibn Amr, brother of AbulYusr ibn Amr. I bore AbdurRahman ibn al-Hubab to him. His wife said: I swear by Allah, you will be sold for his loan.
The Apostle of Allah (PBUH) said: Who is the guardian of al-Hubab?
He was told: His brother, AbulYusr ibn Amr. He then sent for him and said: Set her free; when you hear that some slaves have been brought to me, came to me, and I shall compensate you for her.
She said: They set me free, and when some slaves were brought to the Apostle of Allah (PBUH), he gave them a slave in compensation for me.