The one who knows is a proof over the one who does not know
The virtuous Shaykh, Al-Allamah Rabee al-Madkhali حفظه الله said while discussing a particular narrator:
There are many statements regarding him. There are those who have praised him and those who have criticised him. He has been criticised more, and this is what is more correct. This is because praise is based upon good opinion and upon what is apparent, whereas criticism is built upon study and knowledge. And the one who knows is a proof over the one who does not know even if they (those who do not know) are many.
[وضوح البرهان يدمغ مخالفات عادل آل حمدان، p. 38]
Translator: Yasar A. Rahman