Envy is jealousy excited by the success of others. It is resentment of the spiritual, financial, or material blessings of others. It is wrong longing and desire.
Envy is one of the characteristics of false teachers:
He is proud knowing nothing, but doting about questions and strifes of words, whereof cometh envy, strife, railings, evil surmisings. (I Timothy 6:4)
Envy comes from the spirit of man:
Do ye think that the Scripture saith in vain, The spirit that dwelleth in us lusteth to envy? (James 4:4)
Envy is a sign of being a carnal Christian:
For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men? (I Corinthians 3:3)
Those living in sin are filled with envy:
Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity, whisperers... (Romans 1:29)
For we ourselves also were sometimes foolish, disobedient, and deceived, serving divers lusts and pleasures, living in malice and envy, hateful, and hating one another. (Titus 3:3)
Where there is envy, other problems arise:
But if ye have bitter envying and strife in your hearts, glory not, and lie not against the truth...For where envying and strife is, there is confusion and every evil work. (James 3:14,16)
We are warned not to envy sinners:
Let not thine heart envy sinners; but be thou in the fear of the Lord all the day long. (Proverbs 23:17)