Volume 8, Book 75, Number 318:
Narrated Shaddad bin Aus:
The Prophet said “The most superior way of asking for forgiveness from Allah is: ‘Allahumma anta
Rabbi la ilaha illa anta, Anta Khalaqtani wa ana abduka, wa ana ‘ala ahdika wa wa’dika mastata’tu,
A’udhu bika min Sharri ma sana’tu, abu’u Laka bini’matika ‘alaiya, wa Abu Laka bidhanbi faghfirli
innahu la yaghfiru adhdhunuba illa anta.” The Prophet added. “If somebody recites it during the day
with firm faith in it, and dies on the same day before the evening, he will be from the people of Para –
dise; and if somebody recites it at night with firm faith in it, and dies before the morning, he will be
from the people of Paradise.”