The Prophet ﷺ said: Those who do not show mercy to our young ones and do not realise the right of our elders are not from us. (Using translation from Abū Dāʾūd 4943)
النَّبِيَّ ﷺ قَالَ مَنْ لَمْ يَرْحَمْ صَغِيرَنَا وَيَعْرِفْ حَقَّ كَبِيرِنَا فَلَيْسَ مِنَّا