Allaahumma baa id baynee wa bayna khataayaaya kamaa baa adta baynal-mashriqi walmaghribi, Allaahumma naqqinee min khataayaaya kamaa yunaqqath-thawbul- abyadhu minad-danasi, Allaahum-maghsilnee min khataayaaya, bith-thalji walmaa i walbarad
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.
Muslim: 598