What is the meaning of his statement the devils are chained? When are the devils restrained from you? Allaah says within His noble book:
قُلْ أَعُوذُ بِرَبِّ النَّاسِ ١ مَلِكِ النَّاسِ ٢ إِلَهِ النَّاسِ ٣ مِن شَرِّ الْوَسْوَاسِ الْخَنَّاسِ
Say: I seek refuge with (Allaah) the Lord of mankind, The King of mankind, The King of mankind, The Ilah (God) of mankind; from the evil of the whisperer (devil); who withdraws. (An-Naas 114:1-4)
Al-Waswaas: is the one who whispers; and this is Ash-Shaytaan.
As for the meaning of Al-Khannaas, it is one who is hidden. And when is Shaytaan is hidden from you? When you remember Allaah, Shaytaan becomes hidden from you. Whenever you remember Allaah, Shaytaan flees from you. When you remember Allaah, Shaytaan loses hope in his whispering and his causing corruption. Therefore as you have heard, Shaytaan departs from you in Ramadhaan when you are consistent upon obedience and embark upon the remembrance of Allaah and good deeds. As for if you are not like that, then he does not depart from you, nor can you repel him or wage war against him. Rather, you cause him to remain and you accompany him and aid him against yourself. Due to this Shaykh Al-Islaam Ibn Taymiyah, may Allaah have mercy upon him said: “Within Ramadhaan Shaytaan is restrained and chained from the believer in proportion to how much he remembers Allaah and in proportion to how much he worships Allaah.”
Thus, if you want to restrain the Shaytaan from you, then be from those who hasten to do that. As for submitting yourself to your enemy while wanting to be safe from his tribulations, his threats, his enmity, his beatification of evil and being controlled by him, then you will never be able to be safe nor will you be secure.
Translated by Raha ibn Donald Batts
Taken from the Sermon of the Shaykh: What Shaytaan Does to Some Muslims During Ramadan