﴿ رَّبُّكُمْ أَعْلَمُ بِكُمْ ۖ إِن يَشَأْ يَرْحَمْكُمْ أَوْ إِن يَشَأْ يُعَذِّبْكُمْ ۚ وَمَآ أَرْسَلْنَٰكَ عَلَيْهِمْ وَكِيلًۭا ﴾

“Your Sustainer is fully aware of what you are [and what you deserve]: if He so wills, he will bestow [His] grace upon you; and if He so wills, He will chastise you. Hence, We have not sent thee [unto men, O Prophet,] with the power to determine their fate,”

(Your Lord is best aware of you) He knows what is best for you. (If He will, He will have mercy on you) and save you from the people of Mecca, (or if He will, He will punish you) and arouse them against you. (We have not sent thee (O Muhammad) as a warden over them) such that you will be taken to task over them.