It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them) that Sayyida Aisha (may Allah be pleased with her) wanted to purchase Sayyida Barirah (may Allah be pleased with her), but her owners refused to sell her except on the condition that the right of wala’ (allegiance) would remain with them. When Sayyida Aisha informed the Prophet Muhammad (peace and blessings be upon him) of this, he said: Buy her and set her free, for the right of wala’ belongs only to the one who pays the price.