In ayat 6 of Surat Fatir of the Holy Qur'an, Allah Ta'ala says:--
"Verily, Satan is an enemy to you:
So treat him as an enemy. He only
invites his adherents to be inmates of the blazing fire." (35:6)
Sayyadi Abdullah Ibn Mas'ud, may Allah be pleased with him, said:- "The angel has one sort of enticement and Satan another: the angel entices with the promise of something good, Satan with the promise of something evil.'' In another narration he says: "Satan is brooding over the heart of man: when he recollects Allah, he shrinks away, but when he is forgetful, he whispers".
Cut off his [Satan's] supplies, by being resolved to oppose your lust, and to restrain your soul from transgression and reaching out, for these twin are his allies against you [against us]; and by them his guile is reinforced. But if you follow them, then summon your intellect and the knowledge which Allah has taught you, and with these stand watchful over your soul- guarding your heart and all that enters into it.
If anything of goodness and knowledge follow [after this], follow after it: but if it be of falsehood and evil desire, then with all speed banish it. Tarry not overlong with any dangerous thought, lest the thought become a lust, and the lust an urge, and the urge an act.