'Requirements' in the Bible

So David left Asaph and his relatives there before the ark of the Lord’s covenant to minister regularly before the ark according to the daily requirements.

They offer a burnt offering and fragrant incense to the Lord every morning and every evening, and they set the rows of the bread of the Presence on the ceremonially clean table. They light the lamps of the gold lampstand every evening. We are carrying out the requirements of Yahweh our God, while you have abandoned Him.

Even the stork in the skyknows her seasons.The turtledove, swallow, and craneare aware of their migration,but My people do not knowthe requirements of the Lord.

You have said: “It is useless to serve God. What have we gained by keeping His requirements and walking mournfully before the Lord of Hosts?