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
nasai-kubra:4099 – Qutaybah b. Saʿīd > al-Layth > Nāfiʿ > Ibn ʿUmar

Messenger of Allah (may peace'be upon him) observed once or twice:" May Allah have mercy upon those who get their heads shaved." And he also said:" Upon those too who got their hair clipped." (Using translation from Muslim 1301a)   

الكبرى للنسائي:٤٠٩٩ – أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ قَالَ حَدَّثَنَا اللَّيْثُ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ

حَلَقَ رَسُولُ اللهِ ﷺ وَحَلَقَ طَائِفَةٌ مِنْ أَصْحَابِهِ وَقَصَّرَ بَعْضُهُمْ وَقَالَ ابْنُ عُمَرَ إِنَّ رَسُولَ اللهِ ﷺ قَالَ «يَرْحَمُ اللهُ الْمُحَلِّقِينَ» مَرَّةً أَوْ مَرَّتَيْنِ ثُمَّ قَالَ «وَالْمُقَصِّرِينَ»  

See similar narrations below:

Collected by Muslim, Tirmidhī, Aḥmad, Bayhaqī
muslim:1301a – [Chain 1] Yaḥyá b. Yaḥyá And Muḥammad b. Rumḥ > al-Layth [Chain 2] Qutaybah > Layth > Nāfiʿ > ʿAbdullāh

Messenger of Allah (may peace'be upon him) observed once or twice:" May Allah have mercy upon those who get their heads shaved." And he also said:" Upon those too who got their hair clipped."  

مسلم:١٣٠١a – وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى وَمُحَمَّدُ بْنُ رُمْحٍ قَالاَ أَخْبَرَنَا اللَّيْثُ ح وَحَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا لَيْثٌ عَنْ نَافِعٍ أَنَّ عَبْدَ اللَّهِ قَالَ

حَلَقَ رَسُولُ اللَّهِ ﷺ وَحَلَقَ طَائِفَةٌ مِنْ أَصْحَابِهِ وَقَصَّرَ بَعْضُهُمْ قَالَ عَبْدُ اللَّهِ إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ رَحِمَ اللَّهُ الْمُحَلِّقِينَ مَرَّةً أَوْ مَرَّتَيْنِ ثُمَّ قَالَ وَالْمُقَصِّرِينَ  

tirmidhi:913 – Qutaybah > al-Layth > Nāfiʿ > Ibn ʿUmar

The Messenger of Allah said: "May Allah have mercy upon those who shaved" saying it one or two times, then he said: "And those who shortened."  

الترمذي:٩١٣ – حَدَّثَنَا قُتَيْبَةُ حَدَّثَنَا اللَّيْثُ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ قَالَ

حَلَقَ رَسُولُ اللَّهِ ﷺ وَحَلَقَ طَائِفَةٌ مِنْ أَصْحَابِهِ وَقَصَّرَ بَعْضُهُمْ قَالَ ابْنُ عُمَرَ إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ رَحِمَ اللَّهُ الْمُحَلِّقِينَ مَرَّةً أَوْ مَرَّتَيْنِ ثُمَّ قَالَ وَالْمُقَصِّرِينَ قَالَ وَفِي الْبَابِ عَنِ ابْنِ عَبَّاسٍ وَابْنِ أُمِّ الْحُصَيْنِ وَمَارِبَ وَأَبِي سَعِيدٍ وَأَبِي مَرْيَمَ وَحُبْشِيِّ بْنِ جُنَادَةَ وَأَبِي هُرَيْرَةَ  

قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ وَالْعَمَلُ عَلَى هَذَا عِنْدَ أَهْلِ الْعِلْمِ يَخْتَارُونَ لِلرَّجُلِ أَنْ يَحْلِقَ رَأْسَهُ وَإِنْ قَصَّرَ يَرَوْنَ أَنَّ ذَلِكَ يُجْزِئُ عَنْهُ وَهُوَ قَوْلُ سُفْيَانَ الثَّوْرِيِّ وَالشَّافِعِيِّ وَأَحْمَدَ وَإِسْحَاقَ
ahmad:6005 – Hāshim > Layth > Nāfiʿ > ʿAbdullāh b. ʿUmar

[Machine] He said, "The Messenger of Allah ﷺ shaved his head and a group of his companions also shaved their heads, while some of them trimmed their hair." The Messenger of Allah ﷺ said, "May Allah have mercy on those who shave their heads once or twice, and may Allah have mercy on those who trim their hair."  

أحمد:٦٠٠٥ – حَدَّثَنَا هَاشِمٌ حَدَّثَنَا لَيْثٌ حَدَّثَنَا نَافِعٌ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ

أَنَّهُ قَالَ حَلَقَ رَسُولُ اللهِ ﷺ وَحَلَقَ طَائِفَةٌ مِنْ أَصْحَابِهِ وَقَصَّرَ بَعْضُهُمْ فَقَالَ رَسُولُ اللهِ ﷺ رَحِمَ اللهُ الْمُحَلِّقِينَ مَرَّةً أَوْ مَرَّتَيْنِ ثُمَّ قَالَ وَالْمُقَصِّرِينَ  

bayhaqi:9577 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-Faḍl b. Ibrāhīm > Aḥmad b. Salamah > Qutaybah b.

[Machine] The Messenger of Allah ﷺ shaved his head, and a group of his companions also shaved theirs, while some of them merely shortened their hair. Ibn Umar said, "Indeed, the Messenger of Allah ﷺ said, 'May Allah have mercy on those who shave their heads once or twice.' Then he said, 'And may Allah have mercy on those who only shorten their hair.'"  

البيهقي:٩٥٧٧ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ أنبأ أَبُو الْفَضْلِ بْنُ إِبْرَاهِيمَ ثنا أَحْمَدُ بْنُ سَلَمَةَ ثنا قُتَيْبَةُ بْنُ سَعِيدٍ الثَّقَفِيُّ ثنا اللَّيْثُ عَنْ نَافِعٍ أَنَّ ابْنَ عُمَرَ ؓ قَالَ

حَلَقَ رَسُولُ اللهِ ﷺ وَحَلَقَ طَائِفَةٌ مِنْ أَصْحَابِهِ وَقَصَّرَ بَعْضُهُمْ فَقَالَ ابْنُ عُمَرَ ؓ إِنَّ رَسُولَ اللهِ ﷺ قَالَ رَحِمَ اللهُ الْمُحَلِّقِينَ مَرَّةً أَوْ مَرَّتَيْنِ ثُمَّ قَالَ وَالْمُقَصِّرِينَ  

رَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنْ قُتَيْبَةَ وَذَكَرَهُ الْبُخَارِيُّ