رَّبَّنَا إِنَّنَا سَمِعْنَا مُنَادِيًا يُنَادِي لِلْإِيمَانِ أَنْ آمِنُوا بِرَبِّكُمْ فَآمَنَّا

Rabbanaa innanaa sami'naa munaadiyan yunaadee lil-eemaani an aaminoo bi-Rabbikum fa-aamannaa.

(193) Our Lord, indeed we have heard a caller calling to faith, [saying], 'Believe in your Lord,' and we have believed.

Reference: Surah Ali-Imran 3:193