اَللَّهُمَّ إِنِّي أَعُوذُ بِكَ مِنَ الشَّيْطَانِ الرَّجِيمِ مِنْ هَمْزِهِ وَنَفْخِهِ وَنَفْثِهِ
Transliteration
Allahumma inni a'udhu bika minash-shaytanir-rajimi min hamzihi wa nafkhihi wa nafthih
English meaning
O Allah, I seek refuge in You from the accursed Satan — from his prodding, his blowing, and his spittle.
When is it recited?
Before prayer, when whisperings arise.
Source
Abu Dawud, Salat 121