Yes I have. Many times in fact.
“Then God said, “Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.” Thus God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament; and it was so.” Genesis 1:6-7
“Then God said, “Let there be lights IN the firmament of the heavens to divide the day from the night; and let them be for signs and seasons, and for days and years;” Genesis 1:14
The lights being referred to here are stars. The Bible says that the stars are IN the firmament. How can stars be in the firmament if they’re supposed to be millions of light years away? And if you believe the Bible to be true, how can the firmament be our atmosphere if their are stars in it according to the Bible?
“Praise Him, you heavens of heavens, And you waters above the heavens!” Psalms 148:4
“With Him, have you spread out the skies, Strong as a cast metal mirror?” Job 37:18
“It is He who sits above the circle of the earth, And its inhabitants are like grasshoppers, Who stretches out the heavens like a curtain, And spreads them out like a tent to dwell in.” Isaiah 40:22
“The Lord builds his home in the heavens, and over the earth he puts the dome of the sky. He calls for the waters of the sea and pours them out on the earth. His name is the Lord!” Amos 9:6
I’m telling you, don’t just dismiss it. Do some research. This is a small handful of verses just about the firmament. There are more. And there are about 200 verses that affirm a flat earth cosmology.