Deuteronomy 17:4-6

Holman Christian Standard Bible

⁴ and if you are told or hear about it, you must investigate it thoroughly. If the report turns out to be true that this detestable thing has happened in Israel, ⁵ you must bring out to your gates that man or woman who has done this evil thing and stone them to death. ⁶ The one condemned to die is to be executed on the testimony of two or three witnesses. No one is to be executed on the testimony of a single witness.