A man who is obliged to free a slave

Abu Abdullah al-Jisri said: I said to Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him): A man among us wishes to buy a slave in order to free him; what method should he adopt? He said: When you buy a slave with the intention of freeing him, do not buy him by mentioning the emancipation to his owner, for that is a knot of slavery; rather, buy him silently, and then, if you wish, keep him, and if you wish, free him.

Ibn Ulayyah said: I mentioned the above hadith to Ayyub and he said: The transaction is not complete.

Al-Sha'bi used to say: If a man was obliged to free a slave, and he bought a slave and the condition of freeing him was placed on him at the purchase, this is disliked, and this transaction is not complete.

Ibrahim and al-Sha'bi said: If someone buys a slave and freeing him was part of the conditions of the sale, this transaction is not sound.

Al-Sha'bi and Ibrahim said: When he buys a slave and stipulates the slave's emancipation: they both did not regard it as sound.

Ibrahim said: If a man was obliged to free a slave and then he bought a slave, he should not stipulate at the purchase that he will free him.

Sayyiduna Ibn Umar (may Allah be pleased with them both) was asked: If a man buys a slave girl and settles with her master the condition of freeing her, what then? He said: The reward for freeing her will go to her master.