Jami` at-Tirmidhi Book 43, Hadith 32

from his father, from his grandfather that he Prophet (ﷺ) would take from his beard; from its breadth and its length.

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

Jami` at-Tirmidhi Book 43, Hadith 31
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that the Messenger of Allah (ﷺ) said: "Trim the mustache and leave the beard to grow."

Jami` at-Tirmidhi Book 43, Hadith 33