Have you not seen those who were forbidden to hold secret counsels, and afterwards returned to that which they had been forbidden, and conspired together for sin and wrong doing and disobedience to the Messenger (Muhammad). And when they come to you, they greet you with a greeting wherewith Allah greets you not, and say within themselves: “Why should Allah punish us not for what we say?” Hell will be sufficient for them, they will burn therein, and worst indeed is that destination!
Meaning:-
Forbidden: not allowed; prohibited:
Conspire: plot, scheme, plan