Suuratul – Maryam Verse 65.
رَّبُّ ٱلسَّمَـٰوَٰتِ وَٱلْأَرْضِ وَمَا بَيْنَهُمَا فَٱعْبُدْهُ وَٱصْطَبِرْ لِعِبَـٰدَتِهِۦ ۚ هَلْ تَعْلَمُ لَهُۥ سَمِيًّا ﴿٦٥
65. Lord of the heavens and the earth, and all that is between them, so worship Him (Alone) and be constant and patient in His worship. Do you know of any who is similar to Him? [There is nothing like unto Him].
Tafsir Ibn Kathir
Ar-Rabb is the owner who has full authority over his property. Ar-Rabb, linguistically means, the master or the one who has the authority to lead. All of these meanings are correct for Allah. When it is alone, the word Rabb is used only for Allah. As for other than Allah, it can be used to say Rabb Ad-Dar, the master of such and such object. Further, it was reported that Ar-Rabb is Allah’s Greatest Name.
﴿رَّبُّ السَّمَـوَتِ وَالاٌّرْضِ وَمَا بَيْنَهُمَا﴾
Lord of the heavens and the earth, and all that is between them,
He created all of that, He is the Disposer of its affairs, He is the Legislator over it and He is in absolute control of it, having no one to oppose His decisions.
﴿فَاعْبُدْهُ وَاصْطَبِرْ لِعِبَادَتِهِ هَلْ تَعْلَمُ لَهُ سَمِيّاً﴾
So worship Him and abide patiently in his worship. Do you know of any who is similar to Him?
`Ali bin Abi Talhah related that Ibn `Abbas said that this means, “Do you know any comparison or something similar to the Lord”. Mujahid, Sa`id bin Jubayr, Qatadah, Ibn Jurayj and others all said the same. `Ikrimah related that Ibn `Abbas said, “There is no one named Ar-Rahman (the Most Beneficent) other than Him, Blessed and Exalted is He. Most Holy is His Name.”