It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Allah, the Mighty and Majestic, says: 'O son of Adam! As long as you call upon Me and place your hope in Me, I will forgive you for whatever is in you, despite your sins. If you come to Me with sins filling the earth, I will meet you with forgiveness filling the earth, provided you have not associated anything with Me. And if your sins reach the edges of the sky (the clouds), and then you ask Me for forgiveness, I will forgive you.'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Habib bin Abi Thabit except Qays bin al-Rabi'; Ibrahim bin Ishaq al-Sini is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5483
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 12346، والطبراني فى «الصغير» برقم: 820»