The Call to Tawhid Allah says,

قُلْ

(Say) `O Muhammad, to these disbelievers and idolators,'

Prophetic reply to the Denial and Ridicule of Disbelievers

The infidels saying that their hearts were covered and their ears were leaden, etc., was not because they had become deaf and bereft of intellect; rather it was a kind of ridicule and jest that they used to make. But the reply to this offensive ridicule that the Holy Prophet ﷺ was directed to give was not to be offensive in the like manner, but to express his humility that he ﷺ is not God, having authority over everything, rather he ﷺ is also a human being; the only difference is that his Lord has given him ﷺ guidance through wahy, and has supported him with miracles. It should have resulted in all of them declaring their faith in him. Even now they are advised to turn in worship and obedience to Allah only and to repent and renounce the past sins.