Surah Al-Ikhlas (The Sincerity) is one of the most important surahs. The Prophet ﷺ said it equals one-third of the Quran in meaning.

قُلْ هُوَ اللَّهُ أَحَدٌ

اللَّهُ الصَّمَدُ

لَمْ يَلِدْ وَلَمْ يُولَدْ

وَلَمْ يَكُن لَّهُ كُفُوًا أَحَدٌ

This surah declares Allah's absolute oneness and uniqueness.