Jami at-Tirmidhi 3545 (hasan sahih, al-Albani)

قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ رَغِمَ أَنْفُ رَجُلٍ ذُكِرْتُ عِنْدَهُ فَلَمْ يُصَلِّ عَلَىَّ وَرَغِمَ أَنْفُ رَجُلٍ دَخَلَ عَلَيْهِ رَمَضَانُ ثُمَّ انْسَلَخَ قَبْلَ أَنْ يُغْفَرَ لَهُ وَرَغِمَ أَنْفُ رَجُلٍ أَدْرَكَ عِنْدَهُ أَبَوَاهُ الْكِبَرَ فَلَمْ يُدْخِلاَهُ الْجَنَّةَ ‏"‏ ‏.‏

“Abu Hurairah narrated that the Messenger of Allah ﷺ said:“May the man before whom I am mentioned - and he does not send Salat upon me - be humiliated. And may a man upon whom Ramadan enters and then passes, before he is forgiven, be humiliated. And may a man whose parents reached old age in his presence, and they were not a cause for his entrance to Paradise, be humiliated.””