||The judges shall carefully interrogate [the refuting witnesses], and if the [first] two witnesses are found to have testified falsely against their brother,
Vedarshu hashoftim heytev vehineh ed-sheker ha'ed sheker anah ve'achiv.
||you must do the same to them as they plotted to do to their brother, thus removing evil from your midst.
Va'asitem lo ka'asher zamam la'asot le'achiv uvi'arta hara mikirbecha.
That is, where the sentence has not yet been carried out on the basis of their testimony. However, if it has, the witnesses are not punished, since the punishment is an atonement (Makkoth 5b; Ramban).