The Prophet (ﷺ) forbade the selling of the Wala' (of slaves) or giving it as a present.
Sahih al-Bukhari Book 85, Hadith 33
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We have no Book to recite except the Book of Allah (Qur'an) and this paper. Then `Ali took out the paper, and behold ! There was written in it, legal verdicts about the retaliation for wounds, the ages of the camels (to be paid as Zakat or as blood money). In it was also written: 'Medina is a sanctuary from Air (mountain) to Thaur (mountain). So whoever innovates in it an heresy (something new in religion) or commits a crime in it or gives shelter to such an innovator, will incur the curse of Allah, the angels and all the people, and none of his compulsory or optional good deeds will be accepted on the Day of Resurrection. And whoever (a freed slave) takes as his master (i.e. be-friends) some people other than hi real masters without the permission of his real masters, will incur the curse of Allah, the angels and all the people, and none of his compulsory, or optional good deeds will be accepted on the Day of Resurrection. And the asylum granted by any Muslim is to be secured by all the Muslims, even if it is granted by one of the lowest social status among them; and whoever betrays a Muslim, in this respect will incur the curse of Allah, the angels, and all the people, and none of his Compulsory or optional good deeds will be accepted on the Day of Resurrection."
Sahih al-Bukhari Book 85, Hadith 32 Next Hadith → That Aisha, the mother of the Believers, intended to buy a slave girl in order to manumit her. The slave girl's master said, "We are ready to sell her to you on the condition that her Wala should be for us." Aisha mentioned that to Allah's Messenger (ﷺ) who said, "This (condition) should not prevent you from buying her, for the Wala is for the one who manumits (the slave)."
Sahih al-Bukhari Book 85, Hadith 34
Sahih al-Bukhari Book 85, Hadith 32 Next Hadith → That Aisha, the mother of the Believers, intended to buy a slave girl in order to manumit her. The slave girl's master said, "We are ready to sell her to you on the condition that her Wala should be for us." Aisha mentioned that to Allah's Messenger (ﷺ) who said, "This (condition) should not prevent you from buying her, for the Wala is for the one who manumits (the slave)."
Sahih al-Bukhari Book 85, Hadith 34