6 And God said, “Let there be a vault between the waters to separate water from water.”

Read Genesis 1:6 Using Other Translations

And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
And 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 a space between the waters, to separate the waters of the heavens from the waters of the earth.”