Jami` at-Tirmidhi Book 49, Hadith 38
"The laughter of the Messenger of Allah (ﷺ) was not but smiling."
"I have not seen anyone who smiled more than the Messenger of Allah (ﷺ)."
"My maternal aunt took me to the Prophet (ﷺ), and said: 'O Messenger of Allah! Indeed my nephew is in pain.' So he wiped over my head and supplicated for blessings for me. And he performed Wudu and I drank from the water of his Wudu. Then I stood behind his back, and I looked at the seal between his two shoulder blades, and it resembled the egg of a partridge.