"Do you kiss your children?"

A'isha (Allah be pleased with her) reported that there came a few desert Arabs to Allah's Messenger (S.A.W.S) and said: Do you kiss your children?
He said: Yes.
Thereupon they said: By Allah but we do not kiss our children.
Thereupon Allah's Messenger (may peace be upon him) said: Then what can I do if Allah has deprived you of mercy?
[Sahih Muslim]

Abu Huraira reported that al-Aqra' b. Habis saw Allah's Apostle (may peace be upon him) kissing Hasan.
He said: I have ten children, but I have never kissed any one of them, whereupon
Allah's Messenger (S.A.W.S) said: He who does not show mercy (towards his children), no mercy would be shown to him.
[Sahih Muslim]