A plot of shaytan through good manners
In The Name of Allah, The Most Merciful, The Bestower of Mercy.
Imam Ibn Al-Qayyim, may Allah have mercy upon him] said:
One of the plots and deceptions employed by Shaytaan is to entice a servant of Allah towards sinful behavior by using good manners, friendliness, and cheerfulness, so a person is approached in this manner by someone whose evil one cannot escape except with a smirk, frowning and turning away from him. The enemy (shaytaan) makes it fair-seeming to him to approach this person with a warm demeanor, a pleasant countenance, and charming words, thus establishing a bond with him. However, once he desires to distance himself from this person, he finds himself incapable of doing so. The enemy (shaytaan) persists in his efforts until he attains his objective, thus he cunningly manipulates a servant of Allah through the guise of good behavior and a pleasant countenance. Hence, the knowledgeable scholars concerning the (ailments, weaknesses, and strengths) of the heart advised that one should turn away from the advocates of Bidah- neither greeting nor displaying a friendly demeanor towards them, and instead meeting them with a frown and turning away.
Ighaatha Al-Laffaan 1/140