So they have indeed rejected the truth when it came to them; therefore the truth of what they mocked at will shine upon them.

And certainly messengers before you were rejected, but they were patient on being rejected and persecuted until Our help came to them; and there is none to change the words of Allah, and certainly there has come to you some information about the messengers.

So they have indeed rejected (the truth), therefore the news of that which they mock shall soon come to them.