I fought in Jaish-al-Usra (Ghazwa of Tabuk) along with the Prophet ﷺ and in my opinion that was the best of my deeds. Then I had an employee, who quarrel led with someone and one of the them bit and cut the other's finger and caused his own tooth to fall out. He then went to the Prophet (with a complaint) but the Prophet ﷺ canceled the suit and said to the complainant, "Did you expect him to let his finger in your mouth so that you might snap and cut it (as does a stallion camel)?" Narrated Ibn Juraij from ʿAbdullah bin Abu Mulaika from his grandfather a similar story: A man bit the hand of another man and caused his own tooth to fall out, but Abu Bakr judged that he had no right for compensation (for the broken tooth).  

غَزَوْتُ مَعَ النَّبِيِّ ﷺ جَيْشَ الْعُسْرَةِ فَكَانَ مِنْ أَوْثَقِ أَعْمَالِي فِي نَفْسِي فَكَانَ لِي أَجِيرٌ فَقَاتَلَ إِنْسَانًا فَعَضَّ أَحَدُهُمَا إِصْبَعَ صَاحِبِهِ فَانْتَزَعَ إِصْبَعَهُ فَأَنْدَرَ ثَنِيَّتَهُ فَسَقَطَتْ فَانْطَلَقَ إِلَى النَّبِيِّ ﷺ فَأَهْدَرَ ثَنِيَّتَهُ وَقَالَ أَفَيَدَعُ إِصْبَعَهُ فِي فِيكَ تَقْضَمُهَا قَالَ أَحْسِبُهُ قَالَ كَمَا يَقْضَمُ الْفَحْلُ قَالَ ابْنُ جُرَيْجٍ وَحَدَّثَنِي عَبْدُ اللَّهِ بْنُ أَبِي مُلَيْكَةَ عَنْ جَدِّهِ بِمِثْلِ هَذِهِ الصِّفَةِ أَنَّ رَجُلاً عَضَّ يَدَ رَجُلٍ فَأَنْدَرَ ثَنِيَّتَهُ فَأَهْدَرَهَا أَبُو بَكْرٍ ؓ  

"I went on a campaign with the Messenger of Allah in the Army of Hardship, and this was the deed of which I was most sure. I had a hired man who fought with another person. One of them bit the finger of the other, who pulled his finger away and a front tooth fell out. He went to the Prophet who considered the tooth to be in vain, and said: "Would he put his hand in your mouth for you to bite it?"  

غَزَوْتُ مَعَ رَسُولِ اللَّهِ ﷺ جَيْشَ الْعُسْرَةِ وَكَانَ أَوْثَقَ عَمَلٍ لِي فِي نَفْسِي وَكَانَ لِي أَجِيرٌ فَقَاتَلَ إِنْسَانًا فَعَضَّ أَحَدُهُمَا أُصْبَعَ صَاحِبِهِ فَانْتَزَعَ إِصْبَعَهُ فَأَنْدَرَ ثَنِيَّتَهُ فَسَقَطَتْ فَانْطَلَقَ إِلَى النَّبِيِّ ﷺ فَأَهْدَرَ ثَنِيَّتَهُ وَقَالَ أَفَيَدَعُ يَدَهُ فِي فِيكَ تَقْضَمُهَا  

[Machine] I participated in the battle with the Prophet ﷺ with the army of Al-Usrah. It was one of my most powerful deeds in my own perspective. I had a slave who fought against a man, and the man bit his companion's finger and broke it. He then said, "Would you let your hand devour him?" He (the slave) replied, "I assume that it would devour him as a female camel devours (grass)."  

غَزَوْتُ مَعَ النَّبِيِّ ﷺ جَيْشَ الْعُسْرَةِ وَكَانَ مِنْ أَوْثَقِ أَعْمَالِي فِي نَفْسِي وَكَانَ لِي أَجِيرٌ فَقَاتَلَ إِنْسَانًا فَعَضَّ أَحَدُهُمَا صَاحِبَهُ فَانْتَزَعَ أُصْبُعَهُ فَأَنْدَرَ ثَنِيَّتَهُ وَقَالَ أَفَيَدَعُ يَدَهُ فِي فِيكَ تَقْضِمُهَا؟ قَالَ أَحْسَبُهُ كَمَا يَقْضِمُ الْفَحْلُ  

"I went on a campaign with the Messenger of Allah in the Army of Hardship, and this was the deed of which I was most sure. I had a hired man who fought with another person. One of them bit the finger of the other, who pulled his finger away and a front tooth fell out. He went to the Prophet who considered the tooth to be in vain, and said: "Would he put his hand in your mouth for you to bite it?" (Using translation from Nasāʾī 4769)   

غَزَوْتُ مَعَ رَسُولِ اللَّهِ ﷺ غَزْوَةَ الْعُسْرَةِ وَكَانَتْ أَوْثَقَ أَعْمَالِي فِي نَفْسِي وَكَانَ لِي أَجِيرٌ فَقَاتَلَ إِنْسَانًا فَعَضَّ أَحَدُهُمَا صَاحِبَهُ فَانْتَزَعَ أُصْبُعَهُ فَسَقَطتْ ثَنِيَّتَاهُ فَجَاءَ إِلَى النَّبِيِّ ﷺ فَأَهْدَرَ ثَنِيَّتَهُ قَالَ وَحَسِبْتُ أَنَّ صَفْوَانَ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ «أَيَدَعُ يَدَهُ فِي فِيكَ فَتَقْضِمُهَا كَقَضْمِ الْفَحْلِ؟ »  

[Machine] I participated in the battle of Al-'Usrah with the Messenger of Allah ﷺ . It was one of my most diligent efforts and I had a companion who was fighting against another man. The companion bit his opponent, causing him to let go of his finger, and his thumb fell off. He then came to the Prophet ﷺ and he criticized his action, saying that he feared that Sa'd would say something. The Prophet ﷺ said, "Does he have his hand in your mouth, so you bite it off like a male camel?"  

غَزَوْتُ مَعَ رَسُولِ اللهِ ﷺ غَزْوَةَ الْعُسْرَةِ وَكَانَتْ أَوْثَقَ أَعْمَالِي فِي نَفْسِي وَكَانَ لِي أَجِيرٌ فَقَاتَلَ إِنْسَانًا فَعَضَّ أَحَدُهُمَا صَاحِبَهُ فَانْتَزَعَ أُصْبُعَهُ فَسَقَطَتْ ثَنِيَّتُهُ فَجَاءَ إِلَى النَّبِيِّ ﷺ فَأَهْدَرَ ثَنِيَّتَهُ قَالَ عَطَاءٌ فَخَشِيتُ أَنَّ صَفْوَانَ قَالَ قَالَ رَسُولُ اللهِ ﷺ أَيَدَعُ يَدَهُ فِي فِيكِ فَتَقْضِمَهَا كَقَضْمِ الْفَحْلِ