Abu Ishaq al-Sabay'ai' أبو إسحاق السبيعي عمرو بن عبد الله · The Book of Manumission of Slaves

"If a man emancipates two Muslim women, they will be deliverance from Hell fire; two bones of their will be emancipation for each of his bone." Abu Dawud said: Salim did not hear (traditions) from Shurahbil. Shurahbil died at Siffin.