Read all Ahadith in the book of emancipating slaves by sahih al muslim

Ibn Umar (Allah be pleased with them) reported Allah's Messenger may peace be upon him) as saying: If anyone emancipates his share ina slave and has enough money to pay the full price for him, a fair price for the slave should be fixed, his partners given their shares, and the slave be thus emancipated, otherwise he is emancipated only to the extent of the first man's share.

This hadith has been reported on the authority of Ibn 'Umar through another chain of transmitters.

Abu Huraira (Allah be pleased with him) reported Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) as saying: The slave who is jointly owned by two persons, and is emancipated by one of them, (this one) has liability (upon him to secure complete freedom for that slave).

Abu Huraira (Allah be pleased witli him) reported Allah's Prophet ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) as saying: If anyone emancipates a share in a slave, he is to be completely emancipated if he has money; but if he has none, the slave will be required to work to pay for his freedom, but must not be over-burhened.

This hadith has been narrated on the authority of Sa'id b. Abu 'Aruba with the same chain of transmitters but with the addition: If he (one of the joint owners emancipating the slave) has not (enough) money (to secure freedom for the other half) a fair price for the slave should be fixed, and he will be required to work to pay for his freedom, but must not be over-burdened.

A hadith like this is reported on the authority of the same chain of transmitters but with a slight change of words.

Ibn Umar reported that 'A'isha decided to buy a slave-girl and then set her free, but her masters said: We are prepared to sell her to you on the condition that her right of inheritance would vest with you. She (Hadrat A'isha) made a mention of that to Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) whereupon he said: This should not stand in your way. The right of inheritance vests in one who emancipates.

A'isha (Allah be pjeased with her) reported that Barira came to her in order to seek her help in securing freedom, but she had (so far) paid nothing out of that sum stipulated in the contract. 'A'isba said to her. Go to your family (who owns you), and if they like that I should pay the amount (of the contract) on your behalf (for purchasing your freedom), then I shall have the right in your inheritance. (If they accepted it) I am prepared (to make this payment). Barira made a mention of that to the (members of) her family, but they refused and said: If she (Hadrat 'A'isha) wants to do good to You for the sake of Allah, she may do it, but the right of inheritance will be ours. She (Hadrat 'A'isha) made a mention of that to Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ), and he said to her: Buy her, and emancipate her, for the right of inheritance vests with one who emancipates (the slave). Allah's Messenger, may peace be upon him) then stood up and said: What has happened to the people that they lay down conditions which are not (found) in the Book of Allah? And he who laid down a condition not found in the Book of Allah, that is not valid. even if it is laid down hundred times. The condition laid down by Allah is the most weighty and the most valid.

A'isha, the wife of Allah's Apostle ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ), reported: Barira came to me and said: 'A'isha, I have entered into contract for securing freedom with my family (who owns me) for nine 'uqiyas (of silver), one 'uqiya every year The rest of the hadith is the same (but with this addition): This (the problem of the right of inheritance) should not stand in your way. Buy her, and set her free. He said in a hadith: Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) stood up among men, extolled Allah, praised Him, and then said: for......

A'isha (Allah be pleased with her) reported: Barira came to me and said: My family (owners) have made contract with me (for granting freedom) for nine 'uqiyas (of silver) payable in nine years, one 'uqiya every year. Help me (in making this payment). I said to her: If your family so desires, I am prepared to make them the full payment in one instalment, and thus secure freedom for you, but the right of inheritance will vest in me, if I do so. She (Barira) made a mention of that to her family, but they refused (except) on the condition that the right of inheritance would vest in them. She came to me and made mention of if She ('A'isha) said: I scolded her. She (Barira) said: By Allah, it is not possible (they will never agree to it). And as she was saying it, Allah's messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) heard, and he asked me, I informed him and he said: Buy her and emancipate her, and let the right of inherit- ance vest in them, for they cannot claim it (rightfully) since the right of inherritance vests with one who emancipates (the slave; therefore, these people have no right to lay such false claims). And I did so. She ('A'isha) said: Then Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) delivered a sermon in the evening. He extolled Allah and praised Him with what He deserves, and then said afterwards,: What has happened to the people that they lay down conditions which are not found in the Book of Allah? And the condition which is not found in the Book of Allah is invalid, even if its number is one hundred. The Book of Allah is more true (than any other deed) and the condition laid down by Allah is more binding (than any other condition). What has happened to the people among you that someone among you says: Emancipate so and so, but the right of inheritance vests in me ? Verily, the right of inheritance vests in one who emancipates.