Leviticus 23:37-38

These are the fixed feasts of the Lord, to be kept by you as holy days of worship, for making an offering by fire to the Lord; a burned offering, a meal offering, an offering of beasts, and drink offerings; every one on its special day; In addition to the Sabbaths of the Lord, and in addition to the things you give and the oaths you make and the free offerings to the Lord.