Leviticus 23:37-38

‘These are the appointed times (established feasts) of the LORD, which you shall proclaim to be holy convocations, to present an offering by fire to the LORD, a burnt offering and a grain offering, sacrifices and drink offerings, each on its own day. This is in addition to the [weekly] Sabbaths of the LORD, and in addition to your gifts and all your vowed offerings and all your freewill offerings, which you give to the LORD.