Bulugh al-Maram #326

Narrated Abu Hurairah (RA) Allah's Messenger (ﷺ) used to keep silent - between the opening Takbir of the prayer and the recitation of the Qur'an - for a short while. Then, I asked him (about that) and he replied, "I say, 'O Allah! Keep me apart from my sins (faults) as you have kept apart the east and west. O Allah clean me from my sins as a white garment is cleaned from dirt. O Allah wash me of my sins with water, snow and hail." .