Why does the Bible define itself as "allegory" in both covenants" in Galatians 4?

[Allegory]

Galatians 4 (paraphrased):
Abraham had two sons by two mothers,
which (law/grace) things are an allegory

[??lly]

It doesn't. You are the only one that views everything as an allegory.

[Lilangel]

Paraphrased for sure!

"Abraham had two sons, one by the slave woman and the other by the free woman. His son by the slave woman was born the ordinary way: but his son by the free woman was born as a result of a promise.".

I fail to see the allegory..

[Joe P]

That is why the Bible should not be paraphrased, the root meaning is lost or twisted.

The Bible does not define itself as allegory as you suppose.