The Prophet ﷺ saw Aqra kissing Hasan, so he said to him, "I have ten children, and I have never kissed any one of them."The Prophet ﷺ replied, "Whoever does not show mercy will not be shown mercy."
حدثنا سفيان عن الزهري عن أبي سلمة
أبصر النبي ﷺ الأقرع يقبل حسنا فقال لي عشرة من الولد ما قبلت أحدا منهم قط قال إنه من لا يرحم لا يرحم
Its isnad is sahih. It is a repeat of 7121, but here it has Uyayna bin Hisn instead of Aqra. We noted this narration there and explained that it is more likely correct than that one.