اللَّهُمَّ اغْفِرْ لِي ذَنْبِي كُلَّهُ، دِقَّهُ وَجِلَّهُ، وَأَوَّلَهُ وَآخِرَهُ، وَعَلَانِيَتَهُ وَسِرَّهُ
Transliteration
Allahummaghfir li dhanbi kullahu, diqqahu wa jillahu, wa awwalahu wa akhirahu, wa 'alaniyatahu wa sirrah
English meaning
O Allah, forgive me all my sins, the small and the great, the first and the last, the open and the secret.
When is it recited?
Recited during prostration.
Source
Muslim, Salat 216, 483