'Regular' in the Bible

They gave worship with songs before the House of the Tent of meeting, till Solomon put up the house of the Lord in Jerusalem; and they took their places for their work in their regular order.

sacrificing the regular burnt offerings regularly each morning and evening to the LORD on the altar dedicated to that purpose, doing everything written in the Law of the LORD, just as he had commanded Israel.

At every offering of burned offerings to the Lord, on Sabbaths, and at the new moons, and on the regular feasts, in the number ordered by the law, at all times before the Lord;