Translation:

9. They will say: "Yes indeed: a Warner did come to us but we rejected him and said `Allah never sent down any (Message): ye are in nothing but an egregious delusion!' "

Notes (Tafseer)

5566. Allah's Signs were not only rejected or defied, but their very existence was denied. Nay, more, even their possibility was denied, and alas! righteous people and Prophets were persecuted or mocked (xxxvi. 30). They were called fools or madmen, or men under a delusion!