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.
1 Mufti Taqi Usmani
If their aversion is too hard on you, then seek, if you can, a tunnel into the earth or a ladder unto the sky in order to bring them a sign. Had Allah so willed, He would have brought all of them to the right path. So, never be one of the ignorant.