'Heaven' in the Bible

And David lifted his eyes and saw the angel of Yahweh standing between earth and heaven, with his sword drawn in his hand, stretched out over Jerusalem. Then David and the elders, clothed in sackcloth, fell upon their faces.

Then David built an altar there to Yahweh, and he offered burnt offerings and peace offerings, and he called to Yahweh. And he answered him with fire from heaven upon the altar of burnt offering.

And David did not {take a census of those twenty years old or under} because Yahweh promised to make Israel more numerous than the stars of heaven.