What punishment should I deserve for....

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What punishment should I get for beating my brother misunderstandly ? He asked me a Rs.70 for buying a cosco tennis ball.I said I will not give.He was sad & went.After three hours my Rs.70 was lost from my purse.I thougt he had taken.I asked & beat him.After some time I remembered that I had given given Rs.70 to my friend for buying two film tickets.I was sad and I asked him sorry and he forgive me.But I think I should deserve a punishment.Please send me the punishment for this sin.