Exodus 12:2
From Theonomy Wiki
2 “This month shall be to you the beginning of months. It shall be the first month of the year to you. Exodus 12:2WEB
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The Command[/Principle]
This passage contains a positive command, directed toward Israel: "This month shall be the first month of the year for you".
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This command is part of the Typological/Ceremonial Law. It fits in with laws pertaining to Law Function: Jew/Gentile Cultural Separation. It establishes the Hebrew Calendar and so participates in our understanding of the timing for Holidays.
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This command is fulfilled by Israel when they established and maintained dates according to the calendar given to them by God.