The Idolators and their gods are Fuel for Hell 

Allah says to the people of Makkah, the idolators of the Quraysh and those who followed their religion of idol worship:

إِنَّكُمْ وَمَا تَعْبُدُونَ مِن دُونِ اللَّهِ حَصَبُ جَهَنَّمَ

Certainly you and that which you are worshipping now besides Allah, are (but) Hasab for Hell!

Ibn Abbas said:

"Kindling."

This is like the Ayah:

وَقُودُهَا النَّاسُ وَالْحِجَارَةُ

whose fuel is men and stones. (66:6) 

According to another report, Ibn Abbas said:
حَصَبُ جَهَنَّمَ
 (Hasab for Hell),

means firewood in (the dialect of the people of) Zanjiyyah.

Mujahid, Ikrimah and Qatadah said:

"Its fuel."

Ad-Dahhak said:

"The fuel of Hell means that which is thrown into it."

This was also the view of others. 
 
أَنتُمْ لَهَا وَارِدُونَ
 
 

(Surely) you will enter it.

means, you will go into it.