Leviticus 23:37-39 King James 2000 (KJ2000)

37. These are the feasts of the LORD, which you shall proclaim to be holy convocations, to offer an offering made by fire unto the LORD, a burnt offering, and a grain offering, a sacrifice, and drink offerings, everything on its day:

38. Besides the sabbaths of the LORD, and besides your gifts, and besides all your vows, and besides all your freewill offerings, which you give unto the LORD.

39. Also in the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep a feast unto the LORD seven days: on the first day shall be a sabbath, and on the eighth day shall be a sabbath.

Leviticus 23