الم. اَللَّهُ لَا إِلَهَ إِلَّا هُوَ الْحَيُّ الْقَيُّومُ

Alif-Lam-Mim. Allahu Laa ilaaha illaa Huwa Al-Haiyyul-Qaiyyum

Alif, Lam, Meem. Allah - there is no deity except Him, the Ever-Living, the Sustainer of existence. Asma daughter of Yazid (RA) reported, the Prophet (ﷺ) said: "Allah's Greatest Names is in these two verses: "And your Ilaah (God) is One Ilaah (God), none has the right to be worshipped but He, the Ever-Merciful, the Mercy-Giving' (Surah al-Baqarah: 163)and the beginning of Surah Al 'Imran, "Alif Laam Mim. Allah, there is no deity but He, the Living, the Eternal."

Reference: Sunan Abu Dawud: 1496