One must conceal his sins, repent to Allah, express remorse and do righteous deeds. Kindly refer to the following link(s): https://m.youtube.com/watch?v=90qmmKjF3LY

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No, in sha Allah. But you should start teaching them not to waste food.

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If the sins one had repented from sincerely and expressed remorse, Allah will forgive him.

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