Al-An'am 6:105

Wakathalika nusarrifu al-ayatiwaliyaqooloo darasta walinubayyinahu liqawmin yaAAlamoon

And thus do We diversify the verses so they [i.e., the disbelievers] will say, "You have studied," and so We may make it [i.e., the Qur’ān] clear for a people who know.

This is how We bring the verses in diverse ways, so that they say, “you have been tutored”, and so that We may explain it to people who have knowledge.