The unity of Allah is expressed in Suratul Ikhlas in the Quran. It is a short surah consisting of four verses that emphasize the oneness of Allah and His absolute uniqueness. In this surah, Allah declares that He is one, eternal, self-sufficient, and without any partners or children. The Surah is recited frequently in daily prayers, and it is considered one of the most significant chapters in the Quran due to its emphasis on the Tawheed (Oneness) of Allah.