61وَإِلَىٰ ثَمُودَ أَخَاهُمْ صَـٰلِحًا ۚ قَالَ يَـٰقَوْمِ ٱعْبُدُوا۟ ٱللَّهَ مَا لَكُم مِّنْ إِلَـٰهٍ غَيْرُهُۥ ۖ هُوَ أَنشَأَكُم مِّنَ ٱلْأَرْضِ وَٱسْتَعْمَرَكُمْ فِيهَا فَٱسْتَغْفِرُوهُ ثُمَّ تُوبُوٓا۟ إِلَيْهِ ۚ إِنَّ رَبِّى قَرِيبٌ مُّجِيبٌ
[61] And to Thamud We sent their brother Salih.66 He said "O my people! worship Allah: you have no other Deity than He. It is He Who has created you from the earth and made it a living place for you.67 So ask His forgiveness68 and turn to Him in repentance. Most surely my Lord is near at hand and answers prayers.69
66Please keep in view E.N.'s 57-62 of Al-A'Aaraf.
67This is the proof of the claim: " .... you have no other Deity than Allah" .The argument is based on the fact which the mushriks themselves acknowledged that it is Allah Who is their Creator. Therefore Prophet Salih argued like this: "You yourselves acknowledge that it is Allah Who has created your wonderful human body out of the life-less particles of the earth and that it is Allah Who has made the earth a suitable place for you to live. How can then there be any Deity other than Allah Who may be worthy of Godhead, service and worship?"
68That is, "So ask His forgiveness for the sin you have been committing by worshiping others."
69In this concise sentence, the Qur'an has refuted a grave misunderstanding of the mushriks, which has in every age misled people into wrong creeds. They presumed that Allah lived far away from them and, therefore, was unapproachable like their own rulers on the earth. As the only way of approach to them was an intercessor who alone could receive and present their requests and applications to their rulers, and convey their answers to them, they presumed that there should be some intercessor to help approach Allah and bring to them the answers to their prayers. Obviously this is a false presumption, which has been endorsed and encouraged by clever people that Allah is out of the reach of common people and it is not possible for them to reach Him and present their prayers and get their answers. So they should search for such sacred beings as may have an approach to Him. Accordingly, they tried to secure the services of those who were well-versed in the art of conveying the requests with the necessary presents and gifts to the Highest Authority. This misunderstanding created hosts of intercessors, and the establishment of the system of priesthood, which has so incapacitated the followers of mushrik creeds of ignorance that they cannot perform by themselves any religious ceremony from birth to death.
Now let us consider the concise answer of Prophet Salih, by which he broke asunder the false presumption of the mushriks. It is this: "Allah is near at hand: so you can invoke His help directly without the help of any interceder. He answers prayers: so you can yourselves receive the answer to your prayer. Though He is the Highest, each one of you will find Him so near yourself that you will be able to convey your request even in a whisper, nay, you are permitted to convey your requests openly or secretly to Him. Therefore give up the folly of seeking interceders and setting them up as His partners, and address your prayers to Him Who is near at hand and answers prayers." (Please refer also to E.N. 188 of Al-Baqarah. )