سَلْهُمْ أَيُّهُم بِذَٰلِكَ زَعِيمٌ (40)
(68:40) Ask them: 'Which of them can guarantee that? *22
*22) Za'im in Arabic is used for a person who stands a surety on behalf of another, or is a spokesman of others. Thus, the verse means to ask: "Which of you will come forward and say that he has made such and such a covenant with Allah on your behalf?"