Quran Al-Hadid 57:8
وَمَا لَكُمۡ لَا تُؤۡمِنُونَ بِٱللَّهِ وَٱلرَّسُولُ يَدۡعُوكُمۡ لِتُؤۡمِنُواْ بِرَبِّكُمۡ وَقَدۡ أَخَذَ مِيثَٰقَكُمۡ إِن كُنتُم مُّؤۡمِنِينَ ٨
Translation
And why do you not believe in Allāh while the Messenger invites you to believe in your Lord and He has taken your covenant, if you should [truly] be believers?