Biographers have written that when the time of death approached for his most knowledgeable and intelligent student, Fuzail and some other persons went to see him. Fuzail began to recite the Surah Yasin[1]. The unfortunate student at that time hit his teacher Fuzail saying, "I don't want you to recite the Surah (Quran)."
Just think over the bad luck of a man who had learnt the Holy Quran throughout his life and who had spent his lifetime in mosques, madressas and assemblies of worships and prayers, and at his last moment he says, "I don't want you to recite Quran before me!" The unfortunate fellow did not recite even the Shahaadatain[1] and passed away from this world.
This made Fuzail extremely sorrowful. He took to a corner of his house and stopped going out until he saw his unlucky student in a dream and asked him the cause of his bad behaviour on his deathbed. The late student said, "I had three evil habits due to which I left the world in a state of a disbeliever. They were: I was jealous and never liked that anyone should surpass me."
Yes, jealousy is the bad habit, which destroys faith just as fire reduces wood to ash.
Then evil was the end of those who did evil, because they rejected the communications of Allah and used to mock them. (30:10)
source : http://www.maaref-foundation.com