Targum zu Bamidbar 25:4

And the Lord said to Mosheh, Take all the chiefs of the people, and appoint them for judges, and let them give judgment to put to death the people who have gone astray after Peor, and hang them before the Word of the Lord upon the wood over against the morning sun, and at the departure of the sun take them down and bury them and turn away the strong anger of the Lord from Israel.

And the Word of the Lord said to Mosheh, Take all the chiefs of the people and set them for a Sanhedrin before the Lord, and let them bang all who are worthy of death; and at sunset take down their bodies and bury them, that so may be averted the strong anger of the Lord from Israel.