It wasnarrated that Abu Hurairah said:
"When the Messenger of Allah(ﷺ)said the Takbir (Allah Akbar), he would remain silent betweentheTakbir and the recitation. I said: 'May my father and mother beransomed for you! I noticed that you are silent between the Takbirandthe recitation; please tell me what you say then.' He said: 'Isay:'Allahumma ba'id baini wa baina khatayaya kama ba'adtabainal-mashriqiwal-maghrib; Allahumma naqqini min khatayaykath-thawbil abyad minad-danas; Allahummaghsilni min khatayayabil-ma'i waththalji wal-barad (OAllah, distance me from my sins asYou have distanced the east fromthe west; O Allah purify me of mysins as a white garment is purifiedof dirt; O Allah, cleanse me ofmy sins with water and snow andhail)."
English reference: Vol. 1, Book 5, Hadith 805
Arabic reference: Book 5, Hadith 854