فَإِن لَّمْ يَسْتَجِيبُوا۟ لَكَ فَٱعْلَمْ أَنَّمَا يَتَّبِعُونَ أَهْوَآءَهُمْ ۚ وَمَنْ أَضَلُّ مِمَّنِ ٱتَّبَعَ هَوَىٰهُ بِغَيْرِ هُدًى مِّنَ ٱللَّهِ ۚ إِنَّ ٱللَّهَ لَا يَهْدِى ٱلْقَوْمَ ٱلظَّـٰلِمِينَ
fa-in lam yastajībū laka fa-iʿ'lam annamā yattabiʿūna ahwāahum waman aḍallu mimmani ittabaʿa hawāhu bighayri hudan mina l-lahi inna l-laha lā yahdī l-qawma l-ẓālimīna
If they do not respond to you, you will know that they follow only their own desires. Who is further astray than the one who follows his own desires with no guidance from God? Truly God does not guide those who do wrong.
But if they answer you not (i.e. do not bring the Book nor believe in your doctrine of Islâmic Monotheism), then know that they only follow their own lusts. And who is more astray than one who follows his own lusts, without guidance from Allâh? Verily Allâh guides not the people who are Zâlimûn (wrong-doers, disobedient to Allâh, and polytheists).