Musannaf Ibn Abi Shaybah 39043 — Keeping four wives on accepting

Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates that Sayyidah Aishah (may Allah be pleased with her) intended to buy Sayyidah Barirah (may Allah be pleased with her), so the owners said: "Will you buy her on the condition that her wala' will be ours?" Sayyidah Aishah (may Allah be pleased with her) mentioned this to the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said: "Let this condition not keep you from (buying) Barirah, for wala' goes only to the one who frees." It is mentioned that the view of (Imam) Abu Hanifah is: This condition is invalid and not permissible.