"And it increases the wrongdoers only in loss." Every time something from the Quran comes, they deny it, and thus they increase in loss upon their [existing] loss.
﴿وَلا يَزِيدُ الظَّالِمِينَ إِلا خَسَارًا﴾ كُلَّمَا جَاءَ مِنَ الْقُرْآنِ شَيْءٌ كَذَّبُوا بِهِ، فَازْدَادُوا فِيهِ خَسَارًا إِلَى خسارهم.