وَمَا لَكُمْ لَا تُؤْمِنُونَ بِاللَّهِ وَالرَّسُولُ يَدْعُوكُمْ لِتُؤْمِنُوا بِرَبِّكُمْ وَقَدْ أَخَذَ مِيثَاقَكُمْ إِن كُنتُم مُّؤْمِنِينَ
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سورة الحـديد
(57/8) And what is it with you that you do not believe in Allah! And the Messenger is calling you that you may believe in your Lord. If you are believers Allah has indeed taken your covenant (that earlier you have confirmed your Lord).
Surah Al-Hadid