Sahih Muslim Book 33, Hadith Number 6407.

Chapter : The growth of a child in the womb of a mother and his destiny in regard to his livelihood, his deeds. both good and evil.

Abu Huraira reported Allah’s Messenger (way peace be upon him) as saying: Verily, a person performs deeds for a long time like the deeds of the people of Paradise. Then his deeds are terminated like the deeds of the people of Hell and, verily, a person performs deeds like the denizens of Fire for a long time, and then this deed of his is ultimately followed by the deeds of the people of Paradise.