The Ever-Living (divine name)
Adjective (faʿʿ pattern with doubled final radical). Noun: حَيَاةٌ (life). Often paired with الْقَيُّومُ (the Self-Sustaining).
Āyat al-Kursī (2:255), the Throne Verse, is considered the greatest verse in the Quran. الحَيّ القَيُّوم opens its description of God.