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.
Also at your days of rejoicing, feasts and new moons, you are to blow on the trumpets over your burnt offerings and fellowship offerings. They will then be a reminder for you before Adonai your God. I am Adonai your God!”