Answered by Shaykh Faraz Rabbani
I once bought a flat on mortgage, it was wrong thing to do. Now I am planning to sell it, this way I won’t be paying interest onwards. What should I be doing with the profit which I have made on this flat?

Assalamu alaikum wa rahmatullah
I pray this finds you in the best of health and spirits.
Yes, it would be permitted to keep the profit you make; though it would be praiseworthy to give a little of it in charity, as an expression of your remorse for the original transaction.
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Jazakum Allah khayr. And Allah alone gives success.