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14 And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:
'To open,' as in Revelation 9, signifies communication and conjunction.
(References: Apocalypse Explained 537)
20 Thus says Yahweh: If you can break my covenant of the day, and my covenant of the night, so that there shall not be day and night in their season;