I know that hasad is of the major sins and can affect the person being envied. But I have heard different opinions regarding weather it counts if one wishes in his mind and heart bad things but does not actually do something or makes dua with his tounge? Some say that if its in the mind and heart it can’t affect and also that one won’t get a sin because of it. Others say that it still counts as a sin to wish bad upon someone and can have affect. Which is correct?
If something then happens is the envious person responsible for it, for example if someone dies does God count it on me, that I killed this person?

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It’s not acceptable to think negative of another Mu’min. Thinking bad about people without acting on it can count. Let’s be careful.

It’s important we try control our thoughts about others. It’s not allowed regardless of whether the actions happen or not.