Meaning of the word "no one should be judge in his own cause" in English

What does "no one should be judge in his own cause" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

no one should be judge in his own cause

US /noʊ wʌn ʃʊd bi ˈdʒʌdʒ ɪn hɪz oʊn ˌkɔːz/
"no one should be judge in his own cause" picture
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