The Prophet said: "Trim the mustache and let the beard grow."
Sunan an-Nasa'i Book 48, Hadith 187
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"The Messenger of Allah said to me: 'Five things are from the Fitrah: Trimming the mustache, plucking the armpit hairs, clipping the nails, shaving the pubes and circumcision.'"
Sunan an-Nasa'i Book 48, Hadith 186 Next Hadith → "The Messenger of Allah stayed away from the family of Ja'far (when he died) for three days, then he came to them, and said: 'Do not weep for my brother after today.' Then he said: 'Call my brother's sons to me.' We were brought like little chicks, and he said: 'Call the barber for me.' Then he ordered that our heads be shaved."
Sunan an-Nasa'i Book 48, Hadith 188
Sunan an-Nasa'i Book 48, Hadith 186 Next Hadith → "The Messenger of Allah stayed away from the family of Ja'far (when he died) for three days, then he came to them, and said: 'Do not weep for my brother after today.' Then he said: 'Call my brother's sons to me.' We were brought like little chicks, and he said: 'Call the barber for me.' Then he ordered that our heads be shaved."
Sunan an-Nasa'i Book 48, Hadith 188