Shaykhul-Islām Ibn Taymiyyah رحمه الله stated:

“Indeed the only thing that prevents the Shaytān from entering into the heart of the son of Ādam is that which is in it from the remembrance of Allāh which Allāh sent His Messengers with. If the heart is void of that, the Shaytān takes control of it.”

Allāh تعالى stated:

“And who turns away from the remembrance of Ar-Rahmān (The Most-Merciful) We will appoint for him a Shaytān (Devil) to be his intimate companion.”

[Az-Zukhruf(43):36]

[Majmū Al-Fatāwā 10/399]

قال شيخ الإسلام ابن تيمية رحمه الله:

إن الشيطان إنما يمنعه من الدخول إلى قلب ابن آدم ما فيه من ذكر الله الذي أرسل به رسله فإذا خلا من ذلك تولاه الشيطان. قال الله تعالى

“«و من يعش عن ذكر الرحمن نقيض له شيطانا فهو له قرين»”

[سورة الزخرف:٣٦]

[( مجموع الفتاوى ( ١٠ / ٣٩٩ ]