Abu Dawud Book 24, Hadith Number 3956.

Chapter : Which of the slaves is better that should be emancipated.

Narated By N/A : The tradition mentioned above has also been transmitted by Mu’adh through a different chain of narrators. After mentioning the words “If any Muslim emancipates a Muslim slave and if a woman emancipates a Muslim woman, this version adds: “If a man emancipates two Muslim women, they will be his deliverance from Hell-fire; two bones of theirs will be emancipation for each of his bone.”

Abu Dawud said: Salim did not hear (traditions) from Shurahbil. Shurahbil died at Siffin.