Deuteronomy 17:6-8

New Catholic Bible

⁶ A person can be put to death upon the testimony of two or three witnesses; a person is not to be put to death upon the testimony of a single witness. ⁷ The witnesses will be the first to raise their hand against him to put him to death, then all of the people will raise their hands against him, in order to purge this evil from your midst.

Judges. ⁸ If cases come before you that are too difficult to judge, whether concerning bloodshed, or lawsuits, or assault, then take them to the place that the Lord, your God, will choose.