the continual

Exodus 29:38-42
This is what you are to offer regularly on the altar, each day: two lambs that are a year old. . . .

Numbers 28:3-10, 11, 19, 27
And tell them: This is the offering by fire you are to present to the LORD: two unblemished year-old male lambs, as a regular burnt offering each day. . . .

Numbers 29:2, 8, 13
As a pleasing aroma to the LORD, you are to present a burnt offering of one young bull, one ram, and seven male lambs a year old, all unblemished, . . .

willingly

Leviticus 1:3
If one's offering is a burnt offering from the herd, he is to offer an unblemished male. He must bring it to the entrance of the Tent of Meeting for its acceptance before the LORD.

Deuteronomy 12:6, 17
To that place you are to bring your burnt offerings and sacrifices, your tithes and heave offerings, your vow offerings and freewill offerings, as well as the firstborn of your herds and flocks. . . .

2 Chronicles 29:31, 32
Then Hezekiah said, "Now that you have consecrated yourselves to the LORD, come near and bring sacrifices and thank offerings to the house of the LORD." So the assembly brought sacrifices and thank offerings, and all whose hearts were willing brought burnt offerings. . . .