Musannaf Ibn Abi Shayba 21:86

Abu Bakr narrated to us, he said: Yahya ibn Abi Bukayr narrated to us, he said: Shu'bah narrated to us, from Mujza'ah ibn Zahir al-Aslami, he said: I heard Abdullah ibn Abi Awfa narrating from the Prophet, may Allah bless him and grant him peace, that he used to say: "O Allah, purify me with hail, snow, and cold water. O Allah, purify me from sins and cleanse me of them, just as a white garment is cleansed of filth."