Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:259c – Sahl b. ʿUthmān > Yazīd b. Zurayʿ > ʿUmar b. Muḥammad > Nāfiʿ > Ibn ʿUmar

The Messenger of Allah (may peace be opon him) said: Act against the polytheists, trim closely the moustache and grow beard.  

مسلم:٢٥٩c – حَدَّثَنَا سَهْلُ بْنُ عُثْمَانَ حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ عَنْ عُمَرَ بْنِ مُحَمَّدٍ حَدَّثَنَا نَافِعٌ عَنِ ابْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ خَالِفُوا الْمُشْرِكِينَ أَحْفُوا الشَّوَارِبَ وَأَوْفُوا اللِّحَى  

See similar narrations below:

Collected by Tirmidhī, Aḥmad, Suyūṭī
tirmidhi:2763 – al-Ḥasan b. ʿAlī al-Khalāal > ʿAbdullāh b. Numayr > ʿUbaydullāh b. ʿUmar > Nāfiʿ > Ibn ʿUmar

that the Messenger of Allah ﷺ said: "Trim the mustache and leave the beard to grow."  

Abū ʿĪsá said that this Ḥadīth is Ṣaḥīḥ.
الترمذي:٢٧٦٣ – حَدَّثَنَا الْحَسَنُ بْنُ عَلِيٍّ الْخَلاَّلُ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ نُمَيْرٍ عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللَّهِ ﷺ أَحْفُوا الشَّوَارِبَ وَأَعْفُوا اللِّحَى  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ صَحِيحٌ
ahmad:4654 – Yaḥyá > ʿUbaydullāh > Nāfiʿ > ʿAbdullāh b. ʿUmar

"The Messenger of Allah [SAW] said: 'Let the beard grow and trim the mustache.'" (Using translation from Nasāʾī 5046)  

أحمد:٤٦٥٤ – حَدَّثَنَا يَحْيَى عَنْ عُبَيْدِ اللهِ أَخْبَرَنَا نَافِعٌ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ أَحْفُوا الشَّوَارِبَ وَأَعْفُوا اللِّحَى