Surah Al-An'am · Ayah 35

وَإِن كَانَ كَبُرَ عَلَيْكَ إِعْرَاضُهُمْ فَإِنِ ٱسْتَطَعْتَ أَن تَبْتَغِىَ نَفَقًۭا فِى ٱلْأَرْضِ أَوْ سُلَّمًۭا فِى ٱلسَّمَآءِ فَتَأْتِيَهُم بِـَٔايَةٍۢ ۚ وَلَوْ شَآءَ ٱللَّهُ لَجَمَعَهُمْ عَلَى ٱلْهُدَىٰ ۚ فَلَا تَكُونَنَّ مِنَ ٱلْجَٰهِلِينَ

Wa in kaana kabura 'alaika i'raaduhum fa inistata'ta an tabtaghiya nafaqan fil ardi aw sullaman fis samaaa'i fataa tiyahum bi Aayah; wa law shaaa'al laahu lajama'ahum 'alal hudaa; falaa takoonanna minal jaahileen

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.