Cross reference
Leviticus 23:37
37 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;
Leviticus 23:2
2 Say to the children of Israel, These are the fixed feasts of the Lord, which you will keep for holy meetings: these are my feasts.
Leviticus 23:4
4 These are the fixed feasts of the Lord, the holy days of worship which you will keep at their regular times.
Deuteronomy 16:16-17
16 Three times in the year let all your males come before the Lord your God in the place named by him; at the feast of unleavened bread, the feast of weeks, and the feast of tents: and they are not to come before the Lord with nothing in their hands;
17 Every man is to give as he is able, in the measure of the blessing which the Lord your God has given you.
Ecclesiastes 3:1
1 For everything there is a fixed time, and a time for every business under the sun.