صحيح البخاري Sahih Bukhari كتاب الإجارة The Book of Hiring
بَابُ الأَجِيرِ فِي الْغَزْوِ:

(5) Chapter. Employing labourers for services in holy battles.

2 hadith
Hadith 2265
حَدَّثَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ عُلَيَّةَ ، أَخْبَرَنَا ابْنُ جُرَيْجٍ ، قَالَ : أَخْبَرَنِي عَطَاءٌ ، عَنْ صَفْوَانَ بْنِ يَعْلَى ، عَنْ يَعْلَى بْنِ أُمَيَّةَ رَضِيَ اللَّهُ عَنْهُ ، قَالَ : " غَزَوْتُ مَعَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ 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 صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَأَهْدَرَ ثَنِيَّتَهُ ، وَقَالَ : أَفَيَدَعُ إِصْبَعَهُ فِي فِيكَ تَقْضَمُهَا ، قَالَ : أَحْسِبُهُ قَالَ : كَمَا يَقْضَمُ الْفَحْلُ " .
Narrated Ya`la bin Umaiya: I fought in Jaish-al-Usra (Ghazwa of Tabuk) along with the Prophet 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 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)?"
Hadith Reference Sahih Bukhari / The Book of Hiring / Hadith: 2265
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة
Hadith 2266
قَالَ ابْنُ جُرَيْجٍ : وَحَدَّثَنِي عَبْدُ اللَّهِ بْنُ أَبِي مُلَيْكَةَ ، عَنْ جَدِّهِ بِمِثْلِ هَذِهِ الصِّفَةِ ، أَنَّ رَجُلًا عَضَّ يَدَ رَجُلٍ ، فَأَنْدَرَ ثَنِيَّتَهُ ، فَأَهْدَرَهَا أَبُو بَكْرٍ رَضِيَ اللَّهُ عَنْهُ .
Narrated Ibn Juraij from `Abdullah 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).
Hadith Reference Sahih Bukhari / The Book of Hiring / Hadith: 2266
Hadith Grading محدثین: أحاديث صحيح البخاريّ كلّها صحيحة