The elders of that city. The elders, by the significant act of washing their hands, indicated that they threw off from them, utterly repudiated, the charge of blood-guiltiness on the part of the town which they represented (cf. Psalms 26:6; Psalms 73:13; Matthew 27:24).
This act they were to accompany with a solemn declaration of their innocence of this crime, and of their entire ignorance of the perpetrator of it; and with an earnest cry to God that the sin which had been done might be forgiven. Be merciful … unto; be propitiated towards (literally, cover, כַּפֵּר לְעַמְךָ; for the phrase, כַּפֵר לְ, see Le Deuteronomy 1:4). And lay not innocent blood; the blood of the innocent man who has been slain.