"And by those who glide smoothly" (wa-al-sabihati sab-han): These are the stars, based on His saying: "Each in an orbit is swimming" (kullun fi falakin yasbahun), meaning they are rotating.
﴿والسابحات سبحا﴾ النُّجُومُ لِقَوْلِهِ: ﴿كُلٌّ فِي فَلَكٍ يسبحون﴾ يدورون
