So the one who finds that he harbours jealousy in his soul towards someone else, then it is upon him to treat it with patience and taqwa of Allaah, and dislike it being in his soul. Many religious people do not take a stance against the one who is envied and neither do they help the one who would oppress him, but neither do they establish what is obligatory with respects to his rights. rather when someone censures the one who is envied they do not agree with or aid him in the censure but neither do they mention his praiseworthy qualities. Likewise if someone were to praise him they remain silent. So these people are responsible for their leaving what is commanded with respects to the rights of the envied, and they have exceeded the proper bounds in this eventhough they may not have taken a stance against him. The reward of these people is that their rights in turn will be neglected and on some occasions they will not be treated fairly, and neither will they helped against the one who oppresses them, just as they did not aid the envied who was oppressed.
As for the one who actually takes a stance against the envied, either with words or actions then he will be punished for this, and the one who fears Allaah and is patient and does not become one of the oppressors – Allaah will benefit him for his taqwa.