Surat Al Baqarah (92-93)

{ وَلَقَدْ جَاءكُم مُّوسَى بِالْبَيِّنَاتِ ثُمَّ اتَّخَذْتُمُ الْعِجْلَ مِن بَعْدِهِ وَأَنتُمْ ظَالِمُونَ } [البقرة:  92]

92- Moses (peace be upon him) came to you with conclusive evidence and clear signs such as: The float, locusts, and the stick, as he split the sea among other signs. Yet you worshipped the calf instead of Allah, whereas Moses was speaking to his Lord on the mountain of Tur. By doing that, you were oppressors and disobedient; not believers as you claimed.

{ وَإِذْ أَخَذْنَا مِيثَاقَكُمْ وَرَفَعْنَا فَوْقَكُمُ الطُّورَ خُذُواْ مَا آتَيْنَاكُم بِقُوَّةٍ وَاسْمَعُواْ قَالُواْ سَمِعْنَا وَعَصَيْنَا وَأُشْرِبُواْ فِي قُلُوبِهِمُ الْعِجْلَ بِكُفْرِهِمْ قُلْ بِئْسَمَا يَأْمُرُكُمْ بِهِ إِيمَانُكُمْ إِن كُنتُمْ مُّؤْمِنِينَ } [البقرة:  93]

93- From the examples of your turning away from the truth and disagreement about the covenant is: When We raised the mountain above your heads and We took the covenant from you to believe and obey firmly with determination, you agreed to that but after a while you disobeyed and reverted to your disobedience, stubbornness and followed your whims.

Their hearts absorbed (the worship of) the calf because their disbelief as if it was their favorite stance after every situation. How bad was their faith that instructed them to deny the signs of Allah and disobey their Prophets then disbelieving in Muhammad (peace be upon him), the seal of all Prophets, who was sent to all mankind.

Then, how could you claim faith while you reproached all covenants, denied all the signs of Allah, and worshipped the calf!