"Indeed, Allah is my Lord and your Lord, so worship Him. This is a straight path," meaning: Islam.
﴿إِنَّ اللَّهَ هُوَ رَبِّي وَرَبُّكُمْ فاعبدوه هَذَا صِرَاط مُسْتَقِيم﴾ يَعْنِي: الْإِسْلَام