Sahih InternationalO mankind, worship your Lord, who created you and those before you, that you may become righteous -
This Ayah basically tells all three types of people mentioned in the previous surahs, the reason why the Holy Quran has been revealed to them. It is to give up worshiping other beings and worship Allah (swt) alone. It also explains that the Quran withholds such information and deep knowledge that make it so clear that Allah is the Only One God. Even a man using his common sense alone can witness that through the message of the Holy Quran. The word Rabb indicates that He is the only one who is worthy of worship. This knowledge is so easy to understand that even an iman looking upon this would be able to understand that Allah is the Creator and God is not a created being. This ayah addresses all groups of man. It indicates to the disbelievers to stop believing in created things and worship Allah alone, it tells the hypocrites to be sincere and truthful in their faith and it tells the Muslims to stop sinning and become closer to Allah (swt) and make their obedience towards him more sincere and perfect.