Galatians 4:9, 25, 31

But now after you have known God, or rather are known by God, how is it that you turn again to the weak and beggarly elements, to which you desire again to be in bondage?

for this Hagar is Mount Sinai in Arabia, and corresponds to Jerusalem which now is, and is in bondage with her children

So then, brethren, we are not children of the bondwoman but of the free.