﴿ وَبَشَّرْنَٰهُ بِإِسْحَٰقَ نَبِيًّۭا مِّنَ ٱلصَّٰلِحِينَ ﴾

“And [in time] We gave him the glad tiding of Isaac, [who, too, would be] a prophet, one of the righteous;”

And We gave him the good tidings of the birth of Isaac — some have argued that this proves that the one who was sacrificed was not him Isaac — a prophet nabiyyan is a future circumstantial qualifier that is to say ‘he will come to be with his prophethood decreed one of the righteous.