Invocation
At the start of the prayer (after takbeer)
اللّهُـمَّ باعِـدْ بَيـني وَبَيْنَ خَطـايايَ كَما باعَدْتَ بَيْنَ المَشْرِقِ وَالمَغْرِبْ ، اللّهُـمَّ نَقِّنـي مِنْ خَطايايَ كَمـا يُـنَقَّى الثَّـوْبُ الأَبْيَضُ مِنَ الدَّنَسْ ، اللّهُـمَّ اغْسِلْنـي مِنْ خَطايـايَ بِالثَّلـجِ وَالمـاءِ وَالْبَرَدْ.
O Allah, separate me from my sins as You have separated the East from the West. O Allah, cleanse me of my transgressions as the white garment is cleansed of stains. O Allah, wash away my sins with ice and water and frost.
Al-Bukhari 1/181, Muslim 1/419.