The kohanim Shebaniah, Joshaphat, Nethanel, Amasai, Zechariah, Benaiah and Eliezez were to blow the trumpets before the Ark of God. Obed-edom and Jehiah were gatekeepers for the Ark.
Moses sent them into battle, 1,000 from each tribe, and with them Phinehas son of Eleazar the kohen, who took with him articles from the Sanctuary and trumpets for signaling.