﴿ بَلْ قُلُوبُهُمْ فِى غَمْرَةٍۢ مِّنْ هَٰذَا وَلَهُمْ أَعْمَٰلٌۭ مِّن دُونِ ذَٰلِكَ هُمْ لَهَا عَٰمِلُونَ ﴾

“NAY, [as for those who have torn asunder the unity of faith] - their hearts are lost in ignorance of all this! But apart from that [breach of unity] they have [on their conscience even worse] deeds; and they will [continue to] commit them”

Nay but their hearts that is the hearts of the disbelievers are in ignorance of this Qur’ān and they have other deeds which they will perpetrate besides the ones mentioned against the believers and they will therefore be chastised for them.