'Burnt Offerings' in the Bible

“Speak to Aaron, his sons, and all the Israelites and tell them: Any man of the house of Israel or of the foreign residents in Israel who presents his offering—whether they present freewill gifts or payment of vows to the Lord as burnt offerings—

“These are the Lord’s appointed times that you are to proclaim as sacred assemblies for presenting fire offerings to the Lord, burnt offerings and grain offerings, sacrifices and drink offerings, each on its designated day.