Jami` at-Tirmidhi Book 43, Hadith 31

that the Messenger of Allah (ﷺ) said: "Whoever does not take from his mustache, then he is not from us."

Previous Hadith

"The Prophet (ﷺ) would pare, or take from his mustache, and Ibrahim Khalilur-Rahman would do it (as well)."

Jami` at-Tirmidhi Book 43, Hadith 30
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from his father, from his grandfather that he Prophet (ﷺ) would take from his beard; from its breadth and its length.

Jami` at-Tirmidhi Book 43, Hadith 32