"When the judge passes a judgement in which he strived and was correct, then he receives two rewards. And when he judges and is mistaken, then he receives one reward."  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا حَكَمَ الْحَاكِمُ فَاجْتَهَدَ فَأَصَابَ فَلَهُ أَجْرَانِ وَإِذَا حَكَمَ فَأَخْطَأَ فَلَهُ أَجْرٌ وَاحِدٌ قَالَ وَفِي الْبَابِ عَنْ عَمْرِو بْنِ الْعَاصِي وَعُقْبَةَ بْنِ عَامِرٍ