In my opinion, if the pronoun refers to Saqar, the understood meaning is that Hell-Fire is a warning to mankind.
Warka Dhummay Ciyoon iiga yimid waa mid dhiillo lehe, Dhegahiyo mid weeyaan u daran dhaayihiyo jaaha Waa mid aanan dhaadayn beryahan cidina dhawrayne Dhimirkiyo mid