Reference: Fataawa Noor ‘alad-Darb – Question No.6268, Page 102, Volume 12
Question: What are the religious and worldly benefits of istighfaar?
Response: The benefits of istighfaar are that when a person seeks forgiveness by turning to his Lord honestly and sincerely – and assumes well of Allaah (‘Azza wa Jall), then indeed Allaah (Subhaanahu wa Ta’aala) will forgive his sins, as Allaah (Tabaaraka wa Ta’aala) says:
And when Allaah forgives him his sins, and he fears Allaah (Subhaanahu wa Ta’aala) – then from the benefits of that is Allaah (Ta’aala) will facilitate his affairs with ease, and will provide for him from where he does not expect; just as Allaah (Tabaaraka wa Ta’aala) says:
And He [also] says: