Sayyidina Abu Umamah and some other sahabah (RA) reported that Allah’s Messenger I said, ‘If any Muslim sets a Muslim slave free then against every limb of the slave, a limb of his will be set free from the fire. And, if a Muslim sets two Muslim slavewomen free then a limb of his will be set free against each of their limbs. And, if a Muslim woman sets a Muslim woman free then against each of her limbs a limb of her will be set free.”
[Ahmed 10805]