What is the meaning of Galatians 4:30?

* The two F.O.G. Bibles & Commentary below are currently a work in progress.

But what does the Scripture say? “Expel the slave woman and her son, for the slave woman’s son will never share in the inheritance with the free woman’s son.”

Berean Standard Bible (BSB)

However what does the Scripture say? “Throw out the handmaid and her son, for the son of the handmaid will not inherit with the son of the free woman.”

World English Bible (WEB)

Nevertheless{G235} what{G5101} saith{G3004}{(G5719)} the scripture{G1124}? Cast out{G1544}{(G5628)} the bondwoman{G3814} and{G2532} her{G846} son{G5207}: for{G1063} the son{G5207} of the bondwoman{G3814} shall{G2816} not{G3364} be heir{G2816}{(G5661)} with{G3326} the son{G5207} of the freewoman{G1658}.

Strong's King James

Yet what does the Writing say?"EXPEL THE FEMALE SLAVE AND HER SON, FOR THE SON OF THE FEMALE SLAVE WON'T BE AN HEIR WITH THE SON OF THE FREE."

The F.O.G*

[30] Yet what does Scripture say? "Send away the slave woman and her son, for the slave woman's son will never share in the inheritance with the free woman's son."

The F.O.G Paraphrase

but what saith the Writing? ‘Cast forth the maid-servant and her son, for the son of the maid-servant may not be heir with the son of the free-woman;’

Young's Literal Translation