Hūd

أَلاَّ تَعْبُدُوا إِلاَّ اللَّهَ إِنَّنِي لَكُم مِنْهُ نَذِيرٌ وَبَشِيرٌ

2. “(It teaches) that you should worship none but Allah. Verily, I am for you from Him, a warner and a bearer of glad tidings.”

This verse takes up the most important and the most fundamental issue of the Qur’an, which is monotheism by explaining the campaign against polytheism as follows: Allah’s first and foremost call to mankind is that he should stop worshipping everything else but the Almighty. The verse says:

“(It teaches) that you should worship none but Allah...”

Secondly, the Divine call concerns the matter that the Prophet (S) is surely acting on Allah’s behalf, as a messenger of warning and glad tidings. The duty of the Prophet (S) is that he warns people against disobeying Allah, injustice, corruption, polytheism and infidelity. He informs them of Divine punishment as a result of their evil actions, and give them glad tidings of a happy fate for their obedience, piety and virtuousness. The holy verse continued saying:

“…Verily, I am for you from Him, a warner and a bearer of glad tidings.”