Abu Hurairah (May Allah bepleased with him) reported:The Prophet (PBUH) 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 10 children and I have never kissed any one of them.'' Messenger of Allah (PBUH) looked at him & said, "He who does not show mercy to others will not be shown mercy" Al-Bukhari and Muslim