وَلَقَدْ عَلِمُوا لَمَنِ اشْتَرَاهُ مَا لَهُ فِي الْآخِرَةِ مِنْ خَلَاقٍ
They certainly knew that whoever acquired it would have no share in the Hereafter.
This part of Qur’an 2:102 explicitly mentions knowledge, yet the conduct discussed does not follow its implications. The rhetorical treatment of an informed person as effectively uninformed is therefore intelligible.
Distinguish having knowledge from acting as it requires. A familiar proposition may legitimately be restated to expose negligence rather than to provide a fact the listener has never heard.