He took some money unlawfully. How should he repent?

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As-Salaamu-Alaikum wa Rahmatullahi wa Barakatuh. (May Allah's Peace, Mercy and Blessings be upon all of you)
One of our brothers/sisters has asked this question:
He was employed in a government department, and some income came to him in an unlawful manner. Then Allaah guided him. What should he do about those things that he has spent in an inappropriate manner, knowing that he does not know how much there was?.
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Answer:
Praise be to Allaah.

He has to return what he took from each person to its rightful owner, if he can find him or his heirs. If he tried hard and could not do that, then he should give the money in charity with the intention that it is being given on behalf of its owner. 

And Allaah is the Source of strength. 

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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