اَللَّهُمَّ اِنَّا نَعُوْذُ بِكَ اَنْ نَرْجِعَ عَلٰى أَعْقَابِنَا أَوْ نُفْتَنَ عَنْ دِيْنِنَا.

Allaahumma inna nau’dhu bika an narji’ya ‘alaa a’qaabinaa aw nuftana an dininaa.

O Allah, we seek refuge with You from turning on our heels, or being put to trial in our religion.

Reference: Bukhari: 6593