ANSWER: If they are Muslims, poor and needy, you can give them the zakat. If they are known kafir, you can’t give them zakat. 

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ANSWER: You must not take the money back, if you already took it return it back to him and tell him that you  forgive him and you don’t want the money.

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You must pay your zakat after completion of the lunar year. Whatever possession you have at the end of the lunar year, you pay your zakat on it if it reaches the nisab regardless of when you got your salary.

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