English Translation
Narrated 'Abdullah bin 'Umar: Aisha wanted to buy a slave-girl in order to manumit her. The girl's masters stipulated that her Wala' would be for them. Allah's Apostle said (to 'Aisha), "What they stipulate should not stop you, for the Wala' is for the liberator."
This hadith is from Sahih al-Bukhari, the most rigorously authenticated collection in Islamic scholarship. No editorial opinion is added.