'Duty' in the Bible

Now all the priests who were present had consecrated themselves regardless of their divisions. When the priests came out of the holy place,

And it was the primary [duty] of the trumpeters and singers to make themselves heard [with] one voice, to praise and give thanks to Yahweh. And when a sound from the trumpets, cymbals, and other instruments of song was raised to Yahweh--for he [is] good, because his loyal love [is] everlasting--then the house, the house of Yahweh, was filled with a cloud.

even as the duty of every day required, offering according to the commandment of Moses, on the sabbaths, and on the new moons, and at the set feasts, three times in the year, at the feast of unleavened bread, and at the feast of weeks, and at the feast of tabernacles.

And he appointed, according to the order of David his father, the courses of the priests to their service, and the Levites to their charges, to praise and minister before the priests, as the duty of every day required: the porters also by their courses at every gate: for so had David the man of God commanded.

and the food of his table, and the position of his officers, the duty of his servants and their clothing, his cupbearers and their clothing, and his burnt offerings that he offered at the house of Yahweh, there was no longer any breath in her.

This is what you are to do: a third of you, priests and Levites who are coming on duty on the Sabbath, are to be gatekeepers.

Nobody is to enter the LORD's Temple except for the priests and descendants of Levi who are on duty. They may enter because they are ceremonially holy, but all the rest of the people must observe the LORD's instructions.

So the commanders of hundreds did everything Jehoiada the priest commanded. They each brought their men—those coming on duty on the Sabbath and those going off duty on the Sabbath—for Jehoiada the priest did not release the divisions.

Amaziah gathered Judah together and organized them according to their ancestral households under commanders of thousands and hundreds throughout Judah and Benjamin. He then mustered an army from those who were 20 years old and older. He discovered that there were 300,000 elite soldiers qualified for war duty and capable of handling spears and shields.

Then the men who were designated by name rose up and took the captives, and from the spoil they clothed all those who were naked; they clothed them and gave them sandals, and fed them and gave them [something to] drink, anointed them [with oil, as was a host’s duty], and led all the feeble ones on donkeys, and they brought them to Jericho, the City of Palm Trees, to their brothers (fellow descendants of Israel, i.e. Jacob). Then they returned to Samaria.

In addition, they distributed it to males registered by genealogy three years old and above; to all who would enter the Lord’s temple for their daily duty, for their service in their responsibilities according to their divisions.