Parallel
Galatians 4:25
Robinson-Pierpont Byzantine Textform · Berean Standard Bible
Τὸ γὰρ Ἅγαρ Σινᾶ ὄρος ἐστὶν ἐν τῇ Ἀραβίᾳ, συστοιχεῖ δὲ τῇ νῦν Ἱερουσαλήμ, δουλεύει δὲ μετὰ τῶν τέκνων αὐτῆς.
Now Hagar stands for Mount Sinai in Arabia and corresponds to the present-day Jerusalem, because she is in slavery with her children.