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Lit.. "them".
Another meaning is that those idols will be assembled to witness the torment of their worshippers on Judgment Day.
There is some difference of opinion among Commentators as to the exact meaning to be attached to this clause. As I understand it, the meaning seems to be this. Man is apt to forget or turn away from the true God, the source of all the good which he enjoys, and to go after imaginary powers in the shape of gods, heroes, men, or abstract things like Science or Nature or Philosophy, or superstitious things like Magic, or Good-Fortune or Ill-Fortune, or embodiments of his own selfish desires. He thinks that they might help him in this Life or in the Hereafter (if he believes in a Hereafter). But they cannot help him: on the contrary all things that are false will be brought up and condemned before Allah's Judgment-seat, and the worshippers of the Falsehoods will also be treated as a troop favouring the Falsehoods and therefore worthy of condemnation. The Falsehoods, therefore, instead of helping them, will contribute to their condemnation.