[who say], "our lord, let not our hearts deviate after you have guided us and grant us from...
TRANSCRIPT
[Who say], "Our Lord, let not our hearts deviate after You have guided us and grant us from Yourself mercy. Indeed, You are the Bestower.
The Prophet said:
Beware! There is a piece of flesh in the body if it becomes
good (reformed) the whole body becomes good but if it
gets spoilt the whole body gets spoilt and that is the heart.
[Bukhari ]
The Prophet said:
Verily, the hearts of all the sons of Adam are between the two fingers of Allah. He turns it to
any (direction), He likes.
Then Prophet said:
(O Allah!) O one who turns the hearts make my heart steadfast
upon Your Deen.