Mohammed Baqir Sabzwari in his book ‘Mafatih Najah’ has narrated the incident of Amir al-mu’minin Ali (s.a) concerning the Dua famous as ‘Istegfaar Moajize Asa’
Imam Hussain (a.s.) said : one day I was sitting with my father when an Arab man came to meet him and said o commander of the faithful : I am a family man. I don’t have means to raise them. O my Arab brother, why is it that you don’t seek too much forgiveness that your condition becomes good. The Arab man said o commander of the faithfuls, I have done too much penance, but there is no change in my life. Then Imam recited to him the ayat (verses) of Surah-e-Nooh 10-12
فَقُلْتُ اسْتَغْفِرُوا رَبَّكُمْ إِنَّهُ كَانَ غَفَّارً
telling [them]: ‘‘Plead to your Lord for forgiveness. Indeed, He is all-forgiving.
يُرْسِلِ السَّمَاءَ عَلَيْكُم مِّدْرَارًا
He will send for you abundant rains from the sky(Heaven),
وَيُمْدِدْكُم بِأَمْوَالٍ وَبَنِينَ وَيَجْعَل لَّكُمْ جَنَّاتٍ وَيَجْعَل لَّكُمْ أَنْهَارًا
and aid you with wealth and sons, and provide you with gardens and provide you with streams.

Ask forgiveness of your Lord, surely He is the most Forgiving. He will send down upon you the cloud, pouring down abundance of rain. And help you with wealth and sons, and make for you gardens, and make for you rivers.
Then Imam (a.s.) continued to say that I will give you an penance that you must recite before sleeping. If you recite every night before sleeping this penance than Allah will increase your sustenance.
Imam Hussain (a.s.) says: Then my father wrote it down and while giving said again, whenever you go on the bed with the in tension of sleeping than read this penance in the state of crying. And if tears do not come than at least make a crying face.
Imam Hussain (a.s.) says : One year later the Arab came back and said, ‘O Amir al-mu’minin Ali (s.a) you had said the truth. I have so many camels and cattle that now I don’t have space to tie them.’
Imam Ali (a.s.): I swear by the Allah who has made appointed the prophet Muhammad(s.a), whosoever recites this penance and seeks forgiveness from Allah, he shall be forgiven and his legitimate desires will be fulfilled. And by the blessing of the penance he will be granted more children and wealth.
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