At-Tirmidhi recorded that Abu Hurayrah said: "The Messenger of Allah said:

«رَغِمَ أَنْفُ رَجُلٍ ذُكِرْتُ عِنْدَهُ فَلَمْ يُصَلِّ عَلَيَّ، وَرَغِمَ أَنْفُ رَجُلٍ دَخَلَ عَلَيْهِ شَهْرُ رَمَضَانَ ثُمَّ انْسَلَخَ قَبْلَ أَنْ يُغْفَرَ لَهُ، وَرَغِمَ أَنْفُ رَجُلٍ أَدْرَكَ عِنْدَهُ أَبَوَاهُ الْكِبَرَ فَلَمْ يُدْخِلَاهُ الْجَنَّة»

(May he be humiliated, the man in whose presence I am mentioned and he does not send Salah upon me; may he be humiliated, the man who sees the month of Ramadan come and go, and he is not forgiven; may he be humiliated, the man whose parents live to old age and they do not cause him to be granted admittance to Paradise.)'' Then he (At-Tirmidhi) said: "Hasan Gharib.''