Deuteronomy 19:18

And the judges shall make careful inquiry. And behold, if the witness is a false witness and has testified falsely against his brother,

Deuteronomy 13:14

then you shall inquire and make search, and ask carefully. And behold, if it is true, and the thing is certain, that such an abomination is done among you,

Deuteronomy 17:4

and if it is told you, and you have heard and inquired carefully, and, behold, it is true and the thing is certain, such abomination is done in Israel;

2 Chronicles 19:6-7

And he said to the judges, Take heed what you do. For you do not judge for man, but for Jehovah, who is with you in the judgment.

Job 19:16

I called my servant, and he gave no answer; I must beg him with my mouth.

Treasury of Scripture Knowledge

Summary

And the judges shall make diligent inquisition: and, behold, if the witness be a false witness, and hath testified falsely against his brother;

Bible References

Diligent

Deuteronomy 13:14
then you shall inquire and make search, and ask carefully. And behold, if it is true, and the thing is certain, that such an abomination is done among you,
Deuteronomy 17:4
and if it is told you, and you have heard and inquired carefully, and, behold, it is true and the thing is certain, such abomination is done in Israel;
2 Chronicles 19:6
And he said to the judges, Take heed what you do. For you do not judge for man, but for Jehovah, who is with you in the judgment.
Job 19:16
I called my servant, and he gave no answer; I must beg him with my mouth.

General references

Deuteronomy 5:20
And you shall not bear false witness against your neighbor.
Deuteronomy 25:1
If there is a controversy between men, and they come to judgment, and they have been judged, and the righteous one is declared righteous, and the wrongdoer declared guilty,
John 7:51
Does our law judge the Man before it hears Him and knows what He does?