Yahya related to me from Malik from Ibn Shihab that Ubaydullah
ibn Abdullah ibn Utba ibn Masud told him that Abdullah ibn Masud
bought a slave-girl from his wife, Zaynab Ath Thaqafiyya. She made a
condition to him, that if he bought her, she could always buy her back
for the price that he paid. Abdullah ibn Masud asked Umar ibn al-
Khattab about that and Umar ibn al-Khattab said, "Do not go near her
while anyone has a condition concerning her over you."