A man deals in usury, meaning he lends people a sum of money, let's say one thousand Omani rials, and takes back one thousand two hundred Omani rials in return. He continued in this state for a long time, and after Allah guided him, he performed the Hajj pilgrimage. What is the ruling of Sharia regarding this Hajj? Does he have to return the previous usurious money to its owners, especially since he has repented sincerely?