Jami` at-Tirmidhi Book 49, Hadith 37

"I have not seen anyone who smiled more than the Messenger of Allah (ﷺ)."

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that the Messenger of Allah (ﷺ) would repeat a statement three times so that it could be understood.

Jami` at-Tirmidhi Book 49, Hadith 36
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"The laughter of the Messenger of Allah (ﷺ) was not but smiling."

Jami` at-Tirmidhi Book 49, Hadith 38