(Blameworthy) Envy: It is said that (envy is when a person) wishes that the blessings of Allah (bestowed) on other him should cease. And it is (also) said that it is to dislike the blessings of Allah (bestowed) on other than him, and this second (saying) is the definition (given by) shaykh ul islaam ibn Taymiyyah (Rahimahullah).
He said: whoever dislikes the blessings of Allah (bestowed) on other than him, then he has envied him, regardless whether he desires that it ceases or not. And what he said is the most correct, due to the statement of the prophet (Sallallaahu alaihi wa sallam):
“One of you does not truly believe until he loves for his brother that which he loves for himself”.
Therefore, how can you dislike for your brother that Allaah has favoured him with knowledge, or wealth, or status, or children or other than that, whilst you do not dislike that for yourself?! This is envy, so it is obligated on you to avoid this.
شرح إقتضاء الصراط المستقيم : ص ٢٧