A'udzubillahi Minashaytaanir Rajiim
Iblees (iblis) once came to Prophet Musa A.S. and told him,
Prophet Musa A.S. was happy and thought that Shaytaans’ repentance would put an end to sins.
He therefore made wudu', performed his prayer and make do’a to Allah. In reply, Allah told Prophet Musa A.S.,
"Iblees is lying. He merely wishes to deceive you. If he is really sincere, test him by telling him to prostrate before the grave of Prophet Adam A.S.. If he does this, his repentance will be accepted."
Prophet Musa A.S. was extremely overjoyed, thinking that this was a very easy condition for Iblees to comply with.
When Prophet Musa A.S. informed Iblees about the condition, Iblees became a whirlwind of fire and said,
"I did not prostrate to him while he was alive, how can I prostrate to him when he is dead ?
“Nevertheless, you have done me a good turn by interceding on my behalf. I shall therefore inform you of 3 conditions wherein you should be wary of me.
1) When man is angry, I run in his veins like his blood.
2) I incline the heart of the person fighting in jihad towards his wife, children and wealth, thereby causing him to desert the battlefield. Shaytaan also attempts to dissuade the student of Deen in this manner. Strengthening one's resolve may combat him.
3) When a strange man and woman are in isolation, I become the emissary between the two and incline each one towards the other. I remain engaged in this task until the two are tainted in sin."
extracted from [Tanbeehul Ghafileen]