Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Ja'far ibn Abu Tharwan, may Allah have mercy on him, that Hazrat Ali, may Allah be pleased with him, encouraged the people to provide financial assistance to Ibn al-Nabbah. The people collected for him more than the amount required for his contract of manumission. After paying the amount for the contract of manumission, some was left over. Hazrat Ali, may Allah be pleased with him, gave that to two other contract slaves and had their contract amounts paid.

It is narrated from Hasan (may Allah have mercy on him) that a mukatab asked for the freedom of one or two people, and it was given to him. When it became quite a lot in the view of Hazrat Abu Musa (may Allah be pleased with him), he called him. He came, bringing what had been given to him. Then he (Abu Musa) saw, gave him what he had asked for, and kept the remainder, and with it, he freed one or several slaves.

It is narrated from Hazrat Sabeeh that Hazrat Abdullah bin Abbas (may Allah be pleased with them) encouraged people to collect money for the payment of the contract price of a mukatab. People collected wealth for this purpose, the mukatab paid the contract price, and some wealth was left over. So Hazrat Abdullah bin Abbas (may Allah be pleased with them) gave that remaining wealth to two other mukatabs.