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.
nasai:4772Abū Bakr b. Isḥāq > Abū al-Jawwāb > ʿAmmār > Muḥammad b. ʿAbd al-Raḥman b. Abū Laylá > al-Ḥakam > Muḥammad b. Muslim > Ṣafwān b. Yaʿlá

his father wen on the campaign of Tabuk with the Messenger of Allah, and he hired a man who fought with another man. The man bit his forearm, and when it hurt him, he pulled it away, and the man's front tooth fell out. The matter was referred to the Messenger of Allah who said: "Would one of you deliberately bit his brother as a stallion bites?" And he judged it to be invalid.  

النسائي:٤٧٧٢أَخْبَرَنِي أَبُو بَكْرِ بْنُ إِسْحَاقَ قَالَ حَدَّثَنَا أَبُو الْجَوَّابِ قَالَ حَدَّثَنَا عَمَّارٌ عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى عَنِ الْحَكَمِ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ صَفْوَانَ بْنِ يَعْلَى

أَنَّ أَبَاهُ غَزَا مَعَ رَسُولِ اللَّهِ ﷺ فِي غَزْوَةِ تَبُوكَ فَاسْتَأْجَرَ أَجِيرًا فَقَاتَلَ رَجُلاً فَعَضَّ الرَّجُلُ ذِرَاعَهُ فَلَمَّا أَوْجَعَهُ نَتَرَهَا فَأَنْدَرَ ثَنِيَّتَهُ فَرُفِعَ ذَلِكَ إِلَى رَسُولِ اللَّهِ ﷺ فَقَالَ يَعْمِدُ أَحَدُكُمْ فَيَعَضُّ أَخَاهُ كَمَا يَعَضُّ الْفَحْلُ فَأَبْطَلَ ثَنِيَّتَهُ  


See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:6948Abū Bakr b. Isḥāq al-Ṣāghānī > Abū al-Jawwāb Wāsmuh Aḥwaṣ b. Jawwāb > ʿAmmār > Muḥammad b. ʿAbd al-Raḥman b. Abū Laylá > al-Ḥakam > Muḥammad b. Muslim al-Zuhrī > Ṣafwān b. Yaʿlá

his father wen on the campaign of Tabuk with the Messenger of Allah, and he hired a man who fought with another man. The man bit his forearm, and when it hurt him, he pulled it away, and the man's front tooth fell out. The matter was referred to the Messenger of Allah who said: "Would one of you deliberately bit his brother as a stallion bites?" And he judged it to be invalid. (Using translation from Nasāʾī 4772)  

الكبرى للنسائي:٦٩٤٨أَخْبَرَنِي أَبُو بَكْرِ بْنُ إِسْحَاقَ الصَّاغَانِيُّ قَالَ حَدَّثَنَا أَبُو الْجَوَّابِ وَاسْمُهُ أَحْوَصُ بْنُ جَوَّابٍ قَالَ حَدَّثَنَا عَمَّارٌ عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى عَنِ الْحَكَمِ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ الزُّهْرِيِّ عَنْ صَفْوَانَ بْنِ يَعْلَى

أَنَّ أَبَاهُ غَزَا مَعَ رَسُولِ اللهِ ﷺ فِي غَزْوَةَ تَبُوكَ فَاسْتَأْجَرَ أَجِيرًا فَقَاتَلَ رَجُلًا فَعَضَّ الرَّجُلُ بِذِرَاعِهِ فَلَمَّا أَوْجَعَهُ نَتَرَهَا فَأَنْدَرَ ثَنِيَّتَهُ فَرُفِعَ ذَلِكَ إِلَى رَسُولِ اللهِ ﷺ فَقَالَ «يَعْمَدُ أَحَدُكُمْ فَيَعَضُّ أَخَاهُ كَمَا يَعَضُّ الْفَحْلُ فَأَبْطَلَ ثَنِيَّتَهُ»