﴿ 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 ﴾

“And if it distress thee that those who deny the truth turn their backs on thee - why, then, if thou art able to go down deep into the earth or to ascend a ladder unto heaven in order to bring them a [yet more convincing] message, [do so;] but [remember that] had God so willed, He would indeed have gathered them all unto [His] guidance. Do not, therefore, allow thyself to ignore [God's ways].”

(And if their aversion is grievous unto thee, then, if thou canst, seek a way down) a tunnel (into the earth) such that you enter it (or a ladder) or a method or way which enables you to rise (unto the sky that thou mayst bring unto them a portent (to convince them all)) then do so! (If Allah willed, He could have brought them all together to the guidance) to the declaration of Allah's divine Oneness. (So be not thou among the foolish ones) regarding My decree about their disbelief.