Who purchased the well of Ruma and declared it as a trust :

Who purchased the well of Ruma and declared it as a trust :

۔۔۔۔ ۔ تھےجس نے روما کا کنواں خریدا اور اسے امانت قرار دیا
Explanation

 Uthman bin Affan bought the well and gifted it to Muslims and declared it as a Waqf .