Surah Al-An'am
وَإِن كَانَ كَبُرَ عَلَيْكَ إِعْرَاضُهُمْ فَإِنِ ٱسْتَطَعْتَ أَن تَبْتَغِىَ نَفَقًا فِى ٱلْأَرْضِ أَوْ سُلَّمًا فِى ٱلسَّمَآءِ فَتَأْتِيَهُم بِـَٔايَةٍ ۚ وَلَوْ شَآءَ ٱللَّهُ لَجَمَعَهُمْ عَلَى ٱلْهُدَىٰ ۚ فَلَا تَكُونَنَّ مِنَ ٱلْجَـٰهِلِينَ
Wa in kāna kabura ‘alaika i‘rāḍuhum fa inistaṭa‘ta an tabtagiya nafaqan fil-arḍi au sullaman fis-samā'i fa ta'tiyahum bi'āyah(tin), wa lau syā'allāhu lajama‘ahum ‘alal-hudā falā takūnanna minal-jāhilīn(a).
And if their evasion is difficult for you, then if you are able to seek a tunnel into the earth or a stairway into the sky to bring them a sign, [then do so]. But if Allah had willed, He would have united them upon guidance. So never be of the ignorant.