VERSE 25. And answereth to Jerusalem which now is, and is in bondage with her children.
A little while ago Paul called Mount Sinai, Hagar. He would now gladly make Jerusalem the Sarah of the New Testament, but he cannot. The earthly Jerusalem is not Sarah, but a part of Hagar. Hagar lives there in the home of the Law, the Temple, the priesthood, the ceremonies, and whatever else was ordained in the Law at Mount Sinai.
I would have been tempted to call Jerusalem, Sarah, or the New Testament. I would have been pleased with this turn of the allegory. It goes to show that not everybody has the gift of allegory. Would you not think it perfectly proper to call Sinai Hagar and Jerusalem Sarah? True, Paul does call Sarah Jerusalem. But he has the spiritual and heavenly Jerusalem in mind, not the earthly Jerusalem. Sarah represents that spiritual Jerusalem where there is no Law but only the promise, and where the inhabitants are free.
To show that the Law has been quite abolished, the earthly Jerusalem was completely destroyed with all her ornaments, temples, and ceremonies.