In this Ayah, Allah mentions that He is the only deity, and that He has no partners or equals. He is Allah, the One and Only, the Sustainer, and there is no deity worthy of worship except Him. He is the Most Gracious ـ Ar-Rahman, the Most Merciful ـ Ar-Rahim. We explained the meanings of these two Names in the beginning of Surat Al-Fatihah. Shahr bin Hawshab reported that Asma' bint Yazid bin As-Sakan narrated that Allah's Messenger ﷺ said:

«اسْمُ اللهِ الْأَعْظَمُ فِي هَاتَيْنِ الآيَتَيْنِ

(Allah's Greatest Name is contained in these two Ayat):

When the mushrikin مشرکین ، (the associators) of Arabia heard the verse وَإِلَـٰهُكُمْ إِلَـٰهٌ وَاحِدٌ 'And your god is one God', all against their own belief, they were puzzled thinking how could there be just one single object of worship for the whole wide world. If this was a serious claim, there has to be some proof in support. That proof has been tersely encased in the present two verses.

Understanding Tauhid, the Oneness of Allah, in the wider sense: