Abu Vail Rahimahullahu narrates that a Mukatab (slave) came
to Sayyiduna Ali Radiyallahu anhu and said:
I am unable to pay the agreed amount within the agreed period
(to get myself freed from salvery),
so help me.
Sayyiduna Ali Radiyallahu anhu told him:
Should I not teach you those words,
which Rasulullah Sallallahu Alaihi Wasallam taught me?
If you are in a debt equivalent to Mount Seer (of Yemen),
Allah Subhanahu wa ta'ala will discharge that debt for you.
Say this:
ALLAAHUMMAK-FINEE BI-HA LAALIKA UN-HARAAMIKA
WA AGHNINEE BI-FAZ LIKA AM-MUN SIWAAKA.
( O Allah, suffice for me Your lawful sustenance,
saving me from the unlawful; and by Your Grace,
free me from all, except Yourself.)
{ Tirmidhi }