﴿ كَذَٰلِكَ يَطْبَعُ ٱللَّهُ عَلَىٰ قُلُوبِ ٱلَّذِينَ لَا يَعْلَمُونَ ﴾

“In this way does God seal the hearts of those who do not [want to] know [the truth].”

Thus does God seal the hearts of those who do not know anything of God’s Oneness in the same way that He has sealed the hearts of these aforementioned individuals.