The Quran : Surah AL- Iklas (The Sincerity)

Surah AL-Ikhlaas (The Sincerity) revealed in the earliest period at Makkah, when detailed verses of the Quran dealing with the essence and attributes of Allah Almighty had not yet been revealed, and the people hearing, the Holy Prophet's invitation to Allah, wanted to know what was his Lord like to whose worship and service he was calling them.