Expiation for Unfulfilled Oaths

Bukhari :: Book 8 :: Volume 79 :: Hadith 708

Narrated 'Aisha:

that she intended to buy Barira (a slave girl) and her masters stipulated that they would have her Wala'. When 'Aisha mentioned that to the Prophet ; he said, "Buy her, for the Wala' is for the one who manumits."