His saying: "About what are they asking one another?" Meaning: the polytheists; that is: what is it that they are asking about?
قَوْله: ﴿عَم يتساءلون﴾ يَعْنِي: الْمُشْرِكِينَ؛ أَيْ: مَا الَّذِي يتساءلون عَنهُ.
