رَّبِّ أَعُوذُ بِكَ مِنْ هَمَزَاتِ الشَّيَاطِينِ وَأَعُوذُ بِكَ رَبِّ أَن يَحْضُرُونِ
"My Lord! I seek refuge with You from the whisperings (suggestions) of the Shayatin (devils), And I seek refuge with You, My Lord! lest they may attend (or come near) me."
Sources:
Surah Al-Mu'minoon (23:97,98)