Sura Fuṣṣilat 41:5

وَقَالُوا۟ قُلُوبُنَا فِىٓ أَكِنَّةٍ مِّمَّا تَدْعُونَآ إِلَيْهِ وَفِىٓ ءَاذَانِنَا وَقْرٌ وَمِنۢ بَيْنِنَا وَبَيْنِكَ حِجَابٌ فَٱعْمَلْ إِنَّنَا عَٰمِلُونَ

wa-qālū qulūbunā fī akinnatin mimmā tadʿūnā ilayhi wa-fī ādhāninā waqrun wa-min bayninā wa-baynika ḥijābun fa-iʿmal innanā ʿāmilūna

They say: "Our hearts are under veils, (concealed) from that to which thou dost invite us, and in our ears in a deafness, and between us and thee is a screen: so do thou (what thou wilt); for us, we shall do (what we will!)"

Sura Fuṣṣilat 41:33

وَمَنْ أَحْسَنُ قَوْلًا مِّمَّن دَعَآ إِلَى ٱللَّـهِ وَعَمِلَ صَٰلِحًا وَقَالَ إِنَّنِى مِنَ ٱلْمُسْلِمِينَ

wa-man aḥsanu qawlan mimman daʿā ilā allāhi wa-ʿamila ṣāliḥan wa-qāla innanī mina l-muslimīna

Who is better in speech than one who calls (men) to Allah, works righteousness, and says, "I am of those who bow in Islam"?

Sura Fuṣṣilat 41:48

وَضَلَّ عَنْهُم مَّا كَانُوا۟ يَدْعُونَ مِن قَبْلُ وَظَنُّوا۟ مَا لَهُم مِّن مَّحِيصٍ

wa-ḍalla ʿanhum mā kānū yadʿūna min qablu wa-ẓannū mā lahum min maḥīṣin

The (deities) they used to invoke aforetime will leave them in the lurch, and they will perceive that they have no way of escape.