Genesis 30:40

30:40 Jacob removed these lambs, but he made the rest of the flock face the streaked and completely dark-colored animals in Laban’s flock. So he made separate flocks for himself and did not mix them with Laban’s flocks.

Genesis 1:7

1:7 So God made the expanse and separated the water under the expanse from the water above it. It was so.

Genesis 1:18

1:18 to preside over the day and the night, and to separate the light from the darkness. God saw that it was good.