He Who Does Not Show Mercy
Abu Hurayrah (radi Allahu anhu) reported that the Prophet (sal Allahu alaihi wa sallam) kissed his grandson Al-Hasan bin Ali (radi Allahu anhum) in the presence of Al-Aqra bin Habis. Thereupon he remarked, “I have ten children and I have never kissed any one of them.” The Messenger of Allah (sal Allahu alaihi wa sallam) looked at him and said, “He who does not show mercy to others will not be shown mercy.”
[Sahih al-Bukhari and Muslim]
We learn from this hadith that to kiss children with kindness and affection is not only permissible but also a means of attaining Allah’s Mercy.
And Allah Knows Best!