﴿ خَٰلِدِينَ فِيهِ ۖ وَسَآءَ لَهُمْ يَوْمَ ٱلْقِيَٰمَةِ حِمْلًۭا ﴾

“they will abide in this [state], and grievous for them will be the weight [of that burden] on the Day of Resurrection -”

(Abiding under it) abiding in the punishment for committing idolatry, (an evil burden for them on the Day of Resurrection) their sins are an evil burden for them on the Day of Resurrection,