'Separate' in the Bible

Then God said, “Let there be an expanse in the midst of the waters, and let it separate the waters from the waters.”

Then God said, “Let there be lights in the expanse of the heavens to separate the day from the night, and let them be for signs and for seasons and for days and years;

and to govern the day and the night, and to separate the light from the darkness; and God saw that it was good.

Is not the whole land before you? Please separate from me; if to the left, then I will go to the right; or if to the right, then I will go to the left.”