Al-An‘âm 6:35
وَإِن كَانَ كَبُرَ عَلَيْكَ إِعْرَاضُهُمْ فَإِنِ اسْتَطَعْتَ أَن تَبْتَغِيَ نَفَقًا فِي الْأَرْضِ أَوْ سُلَّمًا فِي السَّمَاءِ فَتَأْتِيَهُم بِآيَةٍ ۚ وَلَوْ شَاءَ اللَّهُ لَجَمَعَهُمْ عَلَى الْهُدَىٰ ۚ فَلَا تَكُونَنَّ مِنَ الْجَاهِلِينَ ٣٥
Wain kana kabura AAalayka iAAraduhum faini istataAAta an tabtaghiya nafaqan fee alardi aw sullaman fee alssamai fatatiyahum biayatin walaw shaa Allahu lajamaAAahum AAala alhuda fala takoonanna mina aljahileena
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And if their disinclination and turning away is distressing you (and you ardently desire them to believe in any case), then, if possible, manage a tunnel, (going down) into the earth, or seek some ladder, (climbing up) to heaven, and bring them some (exceptional) sign (to show them, even then they will not believe). And if Allah so willed, He would indeed assemble them together on guidance. So (owing to the overwhelming enthusiasm generating from your compassion, kindness and concern) do not be unaware (of their ill fortune). (6:35)