اللَّهُمَّ بَاعِدْ بَيْنِي وَبَيْنَ خَطَايَايَ كَمَا بَاعَدْتَ بَيْنَ الْمَشْرِقِ وَالْمَغْرِبِ، اللَّهُمَّ نَقِّنِي مِنْ خَطَايَايَ، كَمَا يُنَقَّى الثَّوْبُ الأَبْيَضُ مِنَ الدَّنَسِ، اللَّهُمَّ اغْسِلْنِي مِنْ خَطَايَايَ، بِالثَّلْجِ وَالْمَاءِ وَالْبَرَدِ.

O Allāh, distance me from my sins just as You have distanced the East from the West. O Allāh, purify me of my sins as a white robe is purified of filth. O Allāh cleanse me of my sins with snow, water, and ice.

Reference: Al-Bukhārī (#744, 1/181) and Muslim (#598, 1/419).