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
tirmidhi:29 – Ibn Abū ʿUmar > Sufyān b. ʿUyaynah > ʿAbd al-Karīm b. Abū al-Mukhāriq Abū Umayyah > Ḥassān b. Bilāl > Raʾayt ʿAmmār b. Yāsir Tawaḍḍaʾ Fakhallal Liḥyatah Faqīl Lah or > Lah Atukhallil Liḥyatak

"1 saw Ammar bin Yasir performing Wudu, so he went through his beard (with his hand). It was said to him" - or he said - "1 said: 'You go through your beard?' He said: 'And what is there to prevent me? Indeed I saw Messenger of Allah going through his beard.'"  

الترمذي:٢٩ – حَدَّثَنَا ابْنُ أَبِي عُمَرَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ عَنْ عَبْدِ الْكَرِيمِ بْنِ أَبِي الْمُخَارِقِ أَبِي أُمَيَّةَ عَنْ حَسَّانَ بْنِ بِلاَلٍ قَالَ رَأَيْتُ عَمَّارَ بْنَ يَاسِرٍ تَوَضَّأَ فَخَلَّلَ لِحْيَتَهُ فَقِيلَ لَهُ أَوْ قَالَ فَقُلْتُ لَهُ أَتُخَلِّلُ لِحْيَتَكَ قَالَ

وَمَا يَمْنَعُنِي وَلَقَدْ رَأَيْتُ رَسُولَ اللَّهِ ﷺ يُخَلِّلُ لِحْيَتَهُ  

See similar narrations below:

Collected by Ibn Mājah
ibnmajah:429 – [Chain 1] Muḥammad b. Abū ʿUmar al-ʿAdanī > Sufyān > ʿAbd al-Karīm Abū Umayyah > Ḥassān b. Bilāl > ʿAmmār b. Yāsir [Chain 2] Ibn Abū ʿUmar > Sufyān > Saʿīd b. Abū ʿArūbah > Qatādah > Ḥassān b. Bilāl > ʿAmmār b. Yāsir

"I saw the Messenger of Allah running his fingers through his beard."  

ابن ماجة:٤٢٩ – حَدَّثَنَا مُحَمَّدُ بْنُ أَبِي عُمَرَ الْعَدَنِيُّ حَدَّثَنَا سُفْيَانُ عَنْ عَبْدِ الْكَرِيمِ أَبِي أُمَيَّةَ عَنْ حَسَّانِ بْنِ بِلاَلٍ عَنْ عَمَّارِ بْنِ يَاسِرٍ ح وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ قَالَ حَدَّثَنَا سُفْيَانُ عَنْ سَعِيدِ بْنِ أَبِي عَرُوبَةَ عَنْ قَتَادَةَ عَنْ حَسَّانِ بْنِ بِلاَلٍ عَنْ عَمَّارِ بْنِ يَاسِرٍ قَالَ

رَأَيْتُ رَسُولَ اللَّهِ ﷺ يُخَلِّلُ لِحْيَتَهُ