'Aishah (May Allah be pleased with him) reported:
I have never seen Messenger of Allah (ﷺ) laughing so heartily that his uvula could be seen. He used to smile only.[Al-Bukhari and Muslim]. (RU)
App reference (RU): Book 2, Hadith 23 (RU)
Arabic/English book reference (RU): Book 2, Hadith 703 (RU)