(18) باب رَحْمَةِ الْوَلَدِ وَتَقْبِيلِهِ وَمُعَانَقَتِهِ
Narrated `Aisha:
A bedouin came to the Prophet (ﷺ) and said, "You (people) kiss the boys! We don't kiss them." The Prophet said, "I cannot put mercy in your heart after Allah has taken it away from it."
Reference: Sahih al-Bukhari 5998
In-book reference: Book 78, Hadith 29
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 73, Hadith 27