The Law covenant was between Jehovah and natural Israel; the new covenant is between Jehovah and spiritual Israel. Moses was the mediator of the former covenant; Jesus is the Mediator of the new one.
(‏ ١ )‏ كَانَ عَهْدُ ٱلشَّرِيعَةِ بَيْنَ يَهْوَهَ وَإِسْرَائِيلَ ٱلطَّبِيعِيِّ ،‏ فِي حِينِ أَنَّ ٱلْعَهْدَ ٱلْجَدِيدَ هُوَ بَيْنَ يَهْوَهَ وَإِسْرَائِيلَ ٱلرُّوحِيِّ .‏