Praise be to Allah who does not place it in the heart. (Qushayri, 79)
Envy (ḥasad) is when your rancor compels you to wish for the disappearance of a blessing possessed by another. Under this influence, you are saddened by the blessing that has befallen someone, and you rejoice if a calamity causes that blessing to vanish. However, this is among the actions of the hypocrites. (Iḥyāʾ, III, 224)
Envy (ḥasad) is desiring that a blessing from Allah, which is beneficial to your Muslim brother, be taken away from him. If you do not wish for that blessing to be removed from him, but rather wish to have its like for yourself, this is not envy (ḥasad) but emulation (ghibṭa). (Minhāj, 35)
Envy (ḥasad) consists of innate qualities in humans and jinn, such as anger, emulation (ghibṭa), greed, covetousness, cowardice, miserliness, and similar traits. It is impossible for these qualities not to exist at all. Only if the very essence (ʿayn) that is characterized by them ceases to exist, will these qualities disappear. Since the Real (al-Ḥaqq) knows that it is not possible to completely eliminate these two types of qualities, He has designated specific situations for their use. When you employ them in the places prescribed by the Lawgiver (shāriʿ), you use them in an obligatory (wājib) or recommended (mandūb) act, and thus perform a praiseworthy deed. If you use them outside the legitimate sphere, then you commit a blameworthy act. (Futūḥāt, II, 192)