The new covenant replaced the Mosaic Law covenant, in which God had promised the Israelites that if they strictly obeyed him, they would become his people. However, Israel did not obey God’s voice.
(‏ ١ كورنثوس ١١ :‏ ٢٥‏ )‏ لقد حلّ العهد الجديد محل عهد الشريعة الموسوية الذي من خلاله وعد الله الاسرائيليين ان يجعلهم شعبه الخاص إن هم اطاعوه .‏