Abu Hurayra reported that the Prophet, may Allah bless him and grant him peace, said, "Anyone who does not show mercy to our children nor acknowledge the right of our old people is not one of us."  

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ لَمْ يَرْحَمْ صَغِيرَنَا وَيَعْرِفْ حَقَّ كَبِيرِنَا فَلَيْسَ مِنَّا  

'Abdullah ibn 'Amr ibn al-'As reported that it reached him that the Prophet, may Allah bless him and grant him peace, said, "Anyone who does not show mercy to our children nor acknowledge the right of our old people is not one of us."  

النَّبِيَّ ﷺ قَالَ مَنْ لَمْ يَرْحَمْ صَغِيرَنَا وَيَعْرِفْ حَقَّ كَبِيرِنَا فَلَيْسَ مِنَّا  

The same from 'Amr ibn Shu'ayb.  

قَالَ رَسُولُ اللهِ ﷺ لَيْسَ مِنَّا مَنْ لَمْ يَعْرِفْ حَقَّ كَبِيرِنَا وَيَرْحَمْ صَغِيرَنَا  

The same from Abu Umama.  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ مَنْ لَمْ يَرْحَمْ صَغِيرَنَا وَيُجِلَّ كَبِيرَنَا فَلَيْسَ مِنَّا