[أم بدر الدين]

So you don't like a person because he/she possesses some thing you imagine to be good that you don't have?
You feel 'sick' whenever you see him/her; hear people talking about him/her or even when you think of him/her while you are alone. This is because he/she is smarter or wealthier or more knowledgeable or intelligent or virtuous than you are. And you are not able to appreciate his/her unique talent or possession or popularity. And by your behavior you try to downgrade, avoid, or defame him/her, feel happy when he/she suffers a loss or is in a difficulty. But you hide this feeling inside yourself. Do you know that this condition is a sickness of soul and heart and it also harms your physical health is called as Envy, Destructive Jealousy (Hasad)?

Hasad (destructive jealousy) is among the most destructive emotions or feeling which a man may have towards his fellow human being. It causes him to wish evil for others and to be happy when misfortune befalls them. On the other hand, what Islam permits in contrast to Hasad (destructive jealousy) is Ghibtah (envy that is free from malice), which means neither loving the loss of the blessing nor hating for it to remain with the person, but desiring the same for oneself without the removal of the blessing from others.

The Prophet of Allah (SWT) said: Beware of envy because indeed envy destroys good deeds in the same manner as fire destroys wood

Imam al-Baqir (as) said: Verily envy destroys faith like fire destroys wood

The Prophet of Allah (SWT) said: Envy appears to take over destiny

The Prophet of Allah (SWT) said: Allah (SWT) the Almighty said to Musa bin Imran (as), Oh son of Imran, don't be envious of what I have given to people from my grace and don't enchant your eyes with the blessings and don't put your soul in search of them, because the envious person is unhappy at my blessings that I have distributed among my servants