وَنَادَيْنَاهُ أَنْ يَا إِبْرَاهِيمُ
Translation: And We called to him: O Abraham!
In nādaynāhu, calling someone already conveys speech. Explanatory an introduces the words of that call.
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The Source Qurʾānic Example
The Two Explanatory Particles: Ay and An
وَنَادَيْنَاهُ أَنْ يَا إِبْرَاهِيمُ
Translation: And We called to him: O Abraham!
In nādaynāhu, calling someone already conveys speech. Explanatory an introduces the words of that call.