I have ten children, but I have never kissed any one of them, whereupon Messenger of Allah ﷺ said: He who does not show mercy (towards his children), no mercy would be shown to him.
أَنَّ الأَقْرَعَ بْنَ حَابِسٍ أَبْصَرَ النَّبِيَّ ﷺ يُقَبِّلُ الْحَسَنَ فَقَالَ إِنَّ لِي عَشَرَةً مِنَ الْوَلَدِ مَا قَبَّلْتُ وَاحِدًا مِنْهُمْ فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّهُ مَنْ لاَ يَرْحَمْ لاَ يُرْحَمْ