Sahih Muslim 2651
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Verily, a man would perform the deeds of the people of Paradise for a long time, then his deeds would be concluded with the deeds of the people of Hell. And verily, a man would perform the deeds of the people of Hell for a long time, and then his deeds would be concluded with the deeds of the people of Paradise.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، - يَعْنِي ابْنَ مُحَمَّدٍ - عَنِ الْعَلاَءِ، عَنْ 
 أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏
"‏ إِنَّ الرَّجُلَ لَيَعْمَلُ الزَّمَنَ
 الطَّوِيلَ بِعَمَلِ أَهْلِ الْجَنَّةِ ثُمَّ يُخْتَمُ لَهُ عَمَلُهُ بِعَمَلِ أَهْلِ النَّارِ وَإِنَّ الرَّجُلَ لَيَعْمَلُ الزَّمَنَ الطَّوِيلَ
 بِعَمَلِ أَهْلِ النَّارِ ثُمَّ يُخْتَمُ لَهُ عَمَلُهُ بِعَمَلِ أَهْلِ الْجَنَّةِ ‏"‏ ‏.‏