﴿ كَذَٰلِكَ نَسْلُكُهُۥ فِى قُلُوبِ ٱلْمُجْرِمِينَ ﴾

“Even so do We [now] cause this [scorn of Our message] to pervade the hearts of those who are lost in sin,”

Thus We cause it to find its way in other words in the same way that We have caused denial to enter the hearts of those individuals We cause it to enter into the hearts of the sinners that is the disbelievers of Mecca.