Deuteronomy 19:18

And the judges will have the question looked into with care: and if the witness is seen to be false and to have made a false statement against his brother,

Deuteronomy 13:14

Then let a full search be made, and let questions be put with care; and if it is true and certain that such a disgusting thing has been done among you;

Deuteronomy 17:4

If word of this comes to your ears, then let this thing be looked into with care, and if there is no doubt that it is true, and such evil has been done in Israel;

2 Chronicles 19:6-7

And said to the judges, Take care what you do, for you are judging not for man but for the Lord, and he is with you in the decisions you give.

Job 19:16

At my cry my servant gives me no answer, and I have to make a prayer to 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
Then let a full search be made, and let questions be put with care; and if it is true and certain that such a disgusting thing has been done among you;
Deuteronomy 17:4
If word of this comes to your ears, then let this thing be looked into with care, and if there is no doubt that it is true, and such evil has been done in Israel;
2 Chronicles 19:6
And said to the judges, Take care what you do, for you are judging not for man but for the Lord, and he is with you in the decisions you give.
Job 19:16
At my cry my servant gives me no answer, and I have to make a prayer to him.

General references

Deuteronomy 5:20
Do not give false witness against your neighbour;
Deuteronomy 25:1
If there is an argument between men and they go to law with one another, let the judges give their decision for the upright, and against the wrongdoer.
John 7:51
Is a man judged by our law before it has given him a hearing and has knowledge of what he has done?

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain