Abu 'Amir was hit with an arrow in his knee, so I went to him and he asked me to remove the arrow. When I removed it, the water started dribbling from it. Then I went to the Prophet ﷺ and told him about it. He said, "O Allah! Forgive ʿUbaid Abu 'Amir."  

رُمِيَ أَبُو عَامِرٍ فِي رُكْبَتِهِ فَانْتَهَيْتُ إِلَيْهِ قَالَ انْزِعْ هَذَا السَّهْمَ فَنَزَعْتُهُ فَنَزَا مِنْهُ الْمَاءُ فَدَخَلْتُ عَلَى النَّبِيِّ ﷺ فَأَخْبَرْتُهُ فَقَالَ اللَّهُمَّ اغْفِرْ لِعُبَيْدٍ أَبِي عَامِرٍ