Leviticus 23:4

These are the fixed feasts of the Lord, the holy days of worship which you will keep at their regular times

Leviticus 23:2

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.

Exodus 23:14

Three times in the year you are to keep a feast to me

Leviticus 23:37

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;

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Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain