15:88 Do not extend your eyes toward that by which We have given enjoyment to [certain] categories of the disbelievers, and do not grieve over them. And lower your wing to the believers
15:89 And say, "Indeed, I am the clear warner" -
15:90 Just as We had revealed [scriptures] to the separators
15:91 Who have made the Qur'an into portions.
Allatheena jaAAaloo alqurana AAideena
The Noble Quran
Who have made the Quran into parts. (i.e. believed in a part and disbelieved in the other).