Reference for Shevuot 61:15

מ"ד משחק בקוביא כל שכן מלך ומ"ד מלך אבל משחק בקוביא מדאורייתא מחזא חזי ורבנן הוא דפסלוהו:

How do we know that a judge should not hear the words of one litigant before the other litigant arrives? - Because it is said: From a false matter keep far. And how do we know that a litigant should not explain his case to the judge before the other litigant arrives? - Because it is said: From a false matter keep far.

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