Deuteronomy 13:14
then you shall investigate and search out [witnesses] and ask thorough questions. If it is true and the matter is established that this loathsome thing has been done among you,
Deuteronomy 17:4
and if it is told to you and you hear about it, then you shall investigate thoroughly [all the charges]. If it is confirmed
Numbers 35:30
‘If anyone kills a person [intentionally], the murderer shall be put to death on the testimony of [two or more] witnesses; but no one shall be put to death on the testimony of [only] one witness.
Deuteronomy 10:18
He
Isaiah 11:3-4
And He will delight in the fear of the Lord,
And He will not judge by what His eyes see,
Nor make decisions by what His ears hear;
John 7:24
1 Timothy 5:19
Do not accept an accusation against an elder unless it is based on [the testimony of at least] two or three witnesses.
Treasury of Scripture Knowledge
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General references
And He will delight in the fear of the Lord,
And He will not judge by what His eyes see,
Nor make decisions by what His ears hear;