اللَّهُمَّ لاَ خَيْرَ إِلاَّ خَيْرُكَ وَلاَ طَيْرَ إِلاَّ طَيْرُكَ، وَلاَ إِلَهَ غَيْرُك

O Allâh, there is no goodness except that which comes from You; and there is no bad omen except what comes from You; and there is no deity besides You. (Ahmad)

 أَنَا عَبْدُ اللَّهِ، مَا شَاءَ اللَّهُ، لَا قُوَّةَ إِلَّا بِاللَّهِ، لَا يَأْتي

بِالْحَسَنَاتِ إِلَّا اللَّهُ، وَلَا يَذْهَبُ بِالسَّيِّئَاتِ إِلَّا اللَّهُ، أَشْهَدُ

أَنَّ اللَّهَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ 

I am the servant of Allâh. Whatever Allâh wills will come to pass. There is no strength except with Allâh. None brings goodness except Allâh. None removes evil besides Allâh. I testify that Allâh Ta'ala has power over everything.

 When any superstitious thought enters the mind, one should recite this duâ and thereafter continue on his way. (Marasîl of Abu Dawûd)