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Ismail ibne Sahl narrates – I asked Imam Reza (a.s.) – Teach me a supplication on reciting which I can be with you (Ahle Bait a.s.) in the world and the hereafter. He (a.s.) wrote to me – Increase recitation of Chapter of إِنَّا أَنْزَلْنَاهُ and habituate your lips to seeking forgiveness.
Salwah al-Hazeen (Al-Dawaat) by Qutb al-Deen al-Raawandi p 49