Deuteronomy 17:7

7 The hands of the witnesses must be the first in putting that person to death, and then the hands of all the people. You must purge the evil from among you.

Read Deuteronomy 17:7 Using Other Translations

The hands of the witnesses shall be first upon him to put him to death, and afterward the hands of all the people. So thou shalt put the evil away from among you.
The hand of the witnesses shall be first against him to put him to death, and afterward the hand of all the people. So you shall purge the evil from your midst.
The witnesses must throw the first stones, and then all the people may join in. In this way, you will purge the evil from among you.