This hadith has been narrated by Abu Huraira by another chain of transmitters.
Sahih Muslim Book 5, Hadith 189
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If anyone extols Allah after every prayer thirty-three times, and praises Allah thirty-three times, and declares His Greatness thirty-three times, ninety-nine times in all, and says to complete a hundred:" There is no god but Allah, having no partner with Him, to Him belongs sovereignty and to Him is praise due, and He is Potent over everything," his sins will be forgiven even If these are as abundant as the foam of the sea.
Sahih Muslim Book 5, Hadith 188 Next Hadith → Messenger of Allah, for whom I would give my father and mother in ransom, what do you recite during your period of silence between the takbir and the recitation? He said: I say (these words):" O Allah, remove my sins from me as Thou hast removed the East from the West. O Allah purify me from sins as a white garment is purified from filth. O Allah! wash away my sins with snow, water, and ice."
Sahih Muslim Book 5, Hadith 190
Sahih Muslim Book 5, Hadith 188 Next Hadith → Messenger of Allah, for whom I would give my father and mother in ransom, what do you recite during your period of silence between the takbir and the recitation? He said: I say (these words):" O Allah, remove my sins from me as Thou hast removed the East from the West. O Allah purify me from sins as a white garment is purified from filth. O Allah! wash away my sins with snow, water, and ice."
Sahih Muslim Book 5, Hadith 190