Abu Hurairah (May Allah bepleased with him) reported:
The Prophet ﷺ kissed his grandson Al-Hasan bin 'Ali (May Allah bepleased with them) in the presence of Al-Aqra' bin Habis. Thereupon he remarked: "I have ten children and I have never kissed any one of them." Messenger of Allah ﷺ looked at him and said, "He who does not show mercy to others will not be shown mercy".

[Al-Bukhari and Muslim].

وعن أبي هريرة رضي الله عنه قال: قبل النبي الحسن بن علي رضي الله عنهما، وعنده الأقرع بن حابس، فقال الأقرع: إن لي عشرة من الولد ما قبلت منهم أحدًا. فنظر إليه رسول الله ﷺ فقال: “من لا يرحم لا يرحم” ((متفق عليه)) .