'Fulfill' in the Bible

David left Asaph and his colleagues there before the ark of the Lord's covenant to serve before the ark regularly and fulfill each day's requirements,

Then you will prosper, if you are careful to observe and fulfill the statutes and ordinances which the Lord commanded Moses concerning Israel. Be strong and courageous, do not fear nor be dismayed.

By doing this, they will fulfill their obligation as trustees over the Tent of Assembly and the Sanctuary, attending to the needs of their relatives, who are descendants of Aaron, in keeping with their service on behalf of the Temple of the LORD."