LXX Deut 21:6

καὶ πᾶσα ἡ γερουσία τῆς πόλεως ἐκείνης οἱ ἐγγίζοντες τῷ τραυματίᾳ τραυματίᾳ τὰς χεῖρας ἐπὶ τὴν κεφαλὴν τῆς δαμάλεως τῆς νενευροκοπημένης ἐν τῇ φάραγγι,

Then all the elders of the city nearest the victim shall wash their hands by the stream over the heifer whose neck has been broken,