A Muslim always resorts to Allah and takes refuge in Him from Satan and his whispers. So, whenever evil thoughts, doubts, or whisperings occur to a person, he or she should come closer to Allah, seek His help and refuge by making du`aa’ (Arabic for: supplication), dhikr (Arabic for: remembrance of Allah) and reciting the Qur’an as well as accompanying righteous people and engaging oneself in good and beneficial deeds.
Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states: Doubts, whispering, anxieties, and the like can be cured only by consistently turning to Allah. Allah alone is the source of peace, and peace is a pure gift He grants to those whom He chooses. Hence, the faithful are ordered to flee to Allah and seek refuge in Him. You should never fail to have a regular dose of du`aaand dhikr. Here are a few:
1.Read Surat Al-Fatiah and Surat Al-Ikhlas and Al-Mu`awwidhatayin as well as Ayat Al-Kursion a regular basis.
2.Never fail to seek refuge in Allah from whisperings of Satan whenever you sense any evil thoughts or suggestions occurring to you.
3. Read the following supplication, which is considered to be beneficial in keeping your mind and heart at peace. Read it on a regular basis while reflecting upon its deeper meanings.
Allahumma ij`al li nafsan mutma‘innatan tuminu bi liqa’ika wa taqna`bi `ata’ika wa tara bi qada’ika wa takhshaka haqqa khashyatika wa la hawla wa la quwwata illa billahi Al-`Aliyy Al-`Azhim.
(Arabic for: O Allah, grant me a tranquil heart that believes in meeting You, is contended with the provision You have granted me, and accepts Your will and fears you as we ought to fear You; there is no will or power except by You, the High, and the Great).