'Duty' in the Bible

When the scouts survey the land and see a human bone, they will place a sign by it, until those assigned to burial duty have buried it in the valley of Hamon-Gog.

It will be the duty of the prince to provide the burnt offerings, the grain offering, and the drink offering at festivals, on the new moons and Sabbaths, at all the appointed feasts of the house of Israel; he will provide the sin offering, the grain offering, the burnt offering, and the peace offerings to make atonement for the house of Israel.