'Duty' in the Bible

They were ministering with song before the tabernacle of the tent of assembly until Solomon built the temple of Yahweh in Jerusalem. And they stood according to their order with respect to their duty.

They spent the night in the vicinity of God’s temple, because they had guard duty and were in charge of opening it every morning.

The singers, the heads of the Levite families, stayed in the temple chambers and were exempt from other tasks because they were on duty day and night.

And he left there, before the ark of the covenant of Jehovah, Asaph and his brethren, to do the service before the ark continually, as every day's duty required;

“but their duty will be to assist the sons of Aaron with the service of the Lord’s temple, being responsible for the courts and the chambers, the purification of all the holy things, and the work of the service of God’s temple—

and that they should keep the duty of the Tent of Meeting, and the duty of the holy place, and the duty of the sons of Aaron their brothers, for the service of the house of Yahweh.

These were their offices and positions for their service in the house of the Lord according to the ordinance given to them by their father (ancestor) Aaron, just as the Lord God of Israel had commanded him.

And David and the commanders of the army set apart for the service the sons of Asaph, [of] Heman, and [of] Jeduthun, who prophesied with stringed instruments, with harps, and with cymbals. And their inventory of the men of the work [and] for their duty was:

All of these sons of Obed-edom, along with their sons and brothers, were valiant men, fully qualified for duty 62 descendants of Obed-edom.

This is the list of the Israelites, the heads of families, the commanders of thousands and the commanders of hundreds, and their officers who served the king in every matter to do with the divisions that were on rotated military duty each month throughout the year. There were 24,000 in each division: