Amr b. al-'As reported that he heard Allah's Messenger (ﷺ) as saying:
When a judge gives a decision, having tried his best to decide correctly and is right, there are two rewards for him; and if he gave a judgment after having tried his best (to arrive at a correct decision) but erred, there is one reward for him.
Reference: Sahih Muslim 1716 a In-book : Book 30, Hadith 18 USC-MSA web (English) : Book 18, Hadith 4261 (deprecated)
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