Muhammad Hamzah Sakura Ryuki 
Islamic Folklore The Sin That Led To His Tawbah Repentance English Edition [EPUB ebook] 

From Prophet Muhammad SAW The Last Messenger of God:
“Allah SWT, Blessed and Exalted, said: O son of Adam, so long as you call upon Me and ask of Me, I shall forgive you for what you have done, and I shall not mind. O son of Adam, if your sins were to reach the clouds of the sky, then you asked forgiveness of Me, I would forgive you.” (Sahih Hadith At-Tirmidhi)
A righteous man was once asked to tell the story of the pivotal moment of his life, the moment in which he first began to apply the teachings of Islam faith, and the following was his answer: When I was a young man, I would not hesitate to perpetrate any sin that was made available to me.