كتاب البر والصلة والآداب
45  
The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
(3)
Chapter: The Disgrace Of One Whose Parents, One Or Both Of Them, Reach Old Age During His Lifetime, And He Does Not Enter Paradise
(3)
باب رَغِمَ أَنْفُ مَنْ أَدْرَكَ أَبَوَيْهِ أَوْ أَحَدَهُمَا عِنْدَ الْكِبَرِ فَلَمْ يَدْخُلِ الْجَنَّةَ ‏
Sahih Muslim 2551 b

Abu Huraira reported Allah's Messenger (ﷺ) as saying:

Let him be humbled, let him be humbled. It was said: Allah's Messenger, who is he? He said. He who finds his parents in old age, either one or both of them, and does not enter Paradise.
حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا جَرِيرٌ، عَنْ سُهَيْلٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ رَغِمَ أَنْفُهُ ثُمَّ رَغِمَ أَنْفُهُ ثُمَّ رَغِمَ أَنْفُهُ ‏"‏ ‏.‏ قِيلَ مَنْ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ مَنْ أَدْرَكَ وَالِدَيْهِ عِنْدَ الْكِبَرِ أَحَدَهُمَا أَوْ كِلَيْهِمَا ثُمَّ لَمْ يَدْخُلِ الْجَنَّةَ ‏"‏ ‏.‏
Reference : Sahih Muslim 2551b
In-book reference : Book 45, Hadith 11
USC-MSA web (English) reference : Book 32, Hadith 6190
  (deprecated numbering scheme)