Deuteronomy 19:18

The judges must make a thorough investigation. If it is found that the witness lied when he testified against the other Israelite,

Deuteronomy 13:14

Investigate and search out and inquire thoroughly. If it is true and the matter established that this abomination has been done among you,

Deuteronomy 17:4

If it is told you and you have heard of it, then you shall inquire thoroughly. If it is true and the thing certain that this detestable thing has been done in Israel,

2 Chronicles 19:6-7

He told the judges: Be careful when you make your decisions in court. Remember these are Jehovah's people. He will know the judgements you decide.

Job 19:16

I call my slave, but he does not answer, even when I beg him.

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
Investigate and search out and inquire thoroughly. If it is true and the matter established that this abomination has been done among you,
Deuteronomy 17:4
If it is told you and you have heard of it, then you shall inquire thoroughly. If it is true and the thing certain that this detestable thing has been done in Israel,
2 Chronicles 19:6
He told the judges: Be careful when you make your decisions in court. Remember these are Jehovah's people. He will know the judgements you decide.
Job 19:16
I call my slave, but he does not answer, even when I beg him.

General references

Deuteronomy 5:20
Do not bear false witness against another man.
Deuteronomy 25:1
When there is a dispute between men and they go to court, and the judges decide their case. They justify the righteous and condemn the wicked.
John 7:51
Does our law convict a man without first hearing from him to find out what he has done?