It wasnarrated that Ibn 'Abbas said:
"The Messenger of Allah (ﷺ)saidto 'Abbas bin 'Abdul-Muttalib: 'O 'Abbas, O my uncle, shall Inotgive you a gift, shall I not give you something, shall I not tellyouof something which, if you do it, will expiate for ten types ofsins?If you do them, Allah will forgive you your sins, the first andthelast of them, the old and the new, the unintentional and thedeliberate, the minor and the major, the secret and the open, tentypes of sin. Pray four Rak'ah, and recite in each Rak'ah theOpeningof the Book (Al-Fatihah) and a Surah. When you have finishedrecitingin the first Rak'ah, while you are standing, say:Subhan-Allah wal-hamdu Lillah wa la ilaha illallah wa Allahu Akbar(Glory if to Allah,praise is to Allah, none has the right to beworshipped but Allah andAllah is the Most Great) fifteen times. Thenbow and say it ten timeswhile you are bowing. Then raise your headfrom Ruku' and say it tentimes. Then go into prostration and sayit ten times while you areprostrating. Then raise your head fromprostration and say it tentimes. Then prostrate and say it tentimes. Then raise your head fromprostration and say it ten times.That will be seventy-five times ineach Rak'ah. Do that in all fourRak'ah. If you can pray it once eachday then do so. If you cannot,then once each week; if you cannot,then once each month. If youcannot, then once in your lifetime.'"
English reference: Vol. 1, Book 5, Hadith 1387
Arabic reference: Book 5, Hadith 1450