﴿ فَقَدْ كَذَّبُوا۟ بِٱلْحَقِّ لَمَّا جَآءَهُمْ ۖ فَسَوْفَ يَأْتِيهِمْ أَنۢبَٰٓؤُا۟ مَا كَانُوا۟ بِهِۦ يَسْتَهْزِءُونَ ﴾

“and so they give the lie to this truth now that it has come unto them. In time, however, they will come to understand what it was that they were wont to deride.”

(And they) the people of Mecca (denied the Truth) the Qur'an and the sign (when it came unto them) when Muhammad (pbuh) came to them. (But there will) this is a threat of punishment (come unto them the tidings of that which they used to deride) the news of their derision and the punishment of their derision on the Day of Badr and the Day of Uhud as well as on the Day of the Confederates.