Fiqh-us-Sunnah Volume 4, Funerals and Dhikr, Fiqh 4.105.

Anas reported that he heard the Prophet, peace be upon him, saying that Allah says, “O son of Adam, whatever you asked Me and expect from Me I forgave – respecting that which you owed to Me – and I don’t care [how great this was]. O Son of Adam, even if your sins pile up to the sky and then you seek My forgiveness I will forgive you, and O son of Adam, even if you have an earthful of sins but you meet Me without associating any other thing with Me I will forgive you.’ (Reported by Tirmizhi, who considers it a hasan sahih hadith)

Abdallah b. ‘Abbas said, “If one supplicates without fail for forgiveness from Allah, He finds a way out for him to get out of every distress and difficulty, and gives him sustenance through ways utterly unthought of.” (Reported by Abu Daw’ud, Nasa’i, Ibn Majah, and Al-Hakim, who says its chain of authorities is sound.)