﴿ فَقَالُوٓا۟ أَبَشَرًۭا مِّنَّا وَٰحِدًۭا نَّتَّبِعُهُۥٓ إِنَّآ إِذًۭا لَّفِى ضَلَٰلٍۢ وَسُعُرٍ ﴾

“and they said: “Are we to follow one single mortal, one from among ourselves? In that case, behold, we would certainly sink into error and folly!”

and they said ‘Is it a mortal basharan is in the accusative because it is governed by a succeeding verb alone among us minnā wāhidan are both adjectives of basharan that we are to follow? nattabi‘uhu this explains the verb which renders it basharan ‘mortal’ accusative; the interrogative is meant as a negative in other words why should we follow him when there are many of us and he is only one among us and not a king? That is to say we will not follow him. Then indeed if we were to follow him we would be in error a parting with reason and insanity!