﴿ وَحَفِظْنَٰهَا مِن كُلِّ شَيْطَٰنٍۢ رَّجِيمٍ ﴾

“and We have made them secure against every satanic force accursed -”

(And We have guarded it from every outcast devil) from every accursed devil who is chased away by the stars to prevent them, i.e. the satans, from listening to the angels,