question #2 Sahih al-Bukhari 5997, Book 78, Hadith 28 : How does the treatment of others relate to receiving mercy according to Islamic teachings?

Allah’s Messenger (ﷺ) kissed Al-Hasan bin `Ali while Al-Aqra’ bin H`Abis at-Tamim was sitting beside him.
Al-Aqra said, “I have ten children and I have never kissed anyone of them,” Allah’s Messenger (ﷺ) cast a
look at him and said, “Whoever is not merciful to others will not be treated mercifully.”