Surah 15. Al-Hijr, Ayah 53

I.e., will be a prophet.

The birth of a son in old age, to a sonless father was glad tidings to Abraham personally. The birth of a son endowed with widsom promised something infinitely more. Considering that the angels were divine messengers, the wisdom referred to was divine wisdom, and the event became an event of prime importance in the world's religious history. For Abraham became, through his progeny, the root of the three great universal religions, diffused throughout the world.