Luke 4:29
And rose up, and thrust him out of the city,
and led him unto the brow of the hill whereon their city was built,
that they might cast him down headlong.

This is the first clear scripture verse that simply does not line up with modern Nazareth being the Bible city.

There is no synagogue by a steep hill, and there is no steep hill that really qualifies.
There are all sorts of hills that have been called the "Cliff of Precipitation".

"The present-day inhabitants of Nazareth can, of course, point out the "precipice.” On the spot, it is not very convincing."
Jesus (1935)
Charles Guignebert
https://archive.org/stream/in.ernet..../n102/mode/1up
Errancy Wiki
http://www.errancywiki.com/index.php?title=Luke_4:29

It was the fact that the New Testament does not line up with the purported Nazareth that led Kevin Kluetz to look for the real Nazareth.