His saying: "By the snorting chargers." Ibn Abbas's interpretation is: they are the horses, and their "dabh" (snorting) is their breathing when they run.
قَوْله: ﴿وَالْعَادِيات ضَبْحًا﴾ تَفْسِيرُ ابْنُ عَبَّاسٍ: هِيَ الْخَيْلُ، وضبحها: أنفاسها إِذا جرت