Tafsir of Hud 11:57

Allah tells;

فٳن تولوا فقد أبلغتكم ما أرسلت به إليكم

So if you turn away, still I have conveyed the Message with which I was sent to you. Hud says to them, "If you turn away from that which I have brought to you in reference to worship of Allah, Who is your Lord alone, without any partners, then the proof has been established against you. This is because I have conveyed the Message of Allah to you, which He has sent me with.''

ويستخلف ربي قوما غيركم

My Lord will make another people succeed you, This refers to a group of people who will worship Allah alone, without associating anything with Him. This also implies that the polytheists do not bother Allah and they do not harm Him in the least with their disbelief. To the contrary, their disbelief merely harms their own selves.

وﻻ تضرونه شييا

and you will not harm Him in the least.

إن ربي على كل شيء حفيظ

Surely, my Lord is Guardian over all things. This means that Allah is a Witness and Guardian over the statements of His servants and their actions. He will give them due recompense for their actions. If they do good deeds, He will reward them with good. If they do evil, He will punish them with evil. The Destruction of the People of `Ad and the Salvation of Those among Them Who believed Allah tells;