Surah 2. Al-Baqara

124At different places the Qur'an has described in detail the hard test to which Abraham was put before he was made the leader and guide of mankind. When he passed successfully through all those trials and proved himself fit and capable of performing this great responsibility, he was exalted to this high position. Ever since the Truth was revealed to him, his whole life was a series of sacrifices in its cause. He sacrificed everything which is valued in life, and encountered every kind of danger in the way of Truth.

125That is, "This promise shall apply only to those of your descendants who will be good and capable, and not to those who will be transgressors." Thus, obviously, the misguided children of Israel and the idolatrous children of Ishmael were not entitled to this promise.