(3) باب الإِصَابَةِ فِي الْحُكْمِ
It was narrated that Abu Hurairah said:
"The Messenger of Allah [SAW] said: 'If a judge passes judgment and strives to reach the right conclusion and gets it right, he will have two rewards; if he strives to reach the right conclusion but gets it wrong, he will still have one reward."
Reference: Sunan an-Nasa'i 5381
In-book reference: Book 49, Hadith 3
English translation: Vol. 6, Book 49, Hadith 5383