This has a quotation within a quotation. It can be stated as an indirect quotation. Alternate translation: "his disciples may ... tell the people that he has risen from the dead, and" (See: [[rc://en/ta/man/jit/figs-quotesinquotes]] and [[rc://en/ta/man/jit/figs-quotations]])
From among all those who have died. The expression "the dead" describes all dead people together in the underworld. To rise from among them speaks of becoming alive again.
The understood information can be stated clearly. Alternate translation: "and if they deceive people by saying that, it will be worse than the way he deceived people before when he said that he was the Christ" (See: [[rc://en/ta/man/jit/figs-explicit]])