Where in the Bible does flat-earth belief start?

Genesis 1:6 describes something separating the waters above from the waters below.The Hebrew word is raqia.Its root is a verb meaning to hammer out flat.It comes from beating metal into a thin sheet.

Biblical scholars widely accept that people of the ancient Near East pictured the sky as a solid cover.Water sat above, and something held it back.In other words, the cosmology of the time was not ours.

Flat-earth material changes the tense.Not that ancient people believed this, but that it is still so.There is a real dome, and the ice cliffs of Antarctica are its rim.The jump from a word's etymology to the present shape of the Earth is the whole move.

Then comes the question of who hid it.Agencies that teach a round Earth and photograph it from orbit appear in turn.Copernicus and astronauts show up on Masonic membership lists.A hidden fact needs someone to hide it.

The etymology and the ancient cosmology can be checked.Everything past that is the sources' claim.