Israel’s disobedience did not mean that the Law covenant had failed (See paragraphs 3 - 6) What did the Law accomplish?
فَقَدْ كَانَ هَدَفُهَا أَنْ تَحْمِيَ ٱلنَّسْلَ وَتَقُودَ ٱلْبَشَرَ إِلَى ٱلْمَسِيَّا .‏