وَاِنۡ کُنۡتُمۡ فِىۡ رَيۡبٍ مِّمَّا نَزَّلۡنَا عَلٰى عَبۡدِنَا فَاۡتُوۡا بِسُوۡرَةٍ مِّنۡ مِّثۡلِهٖ وَادۡعُوۡا شُهَدَآءَكُمۡ مِّنۡ دُوۡنِ اللّٰهِ اِنۡ كُنۡتُمۡ صٰدِقِيۡنَ(البقرة :23)
Wain kuntum fee raybin mimma nazzalna 'ala 'abdina fatoo bisooratin min mithlihi waod'oo shuhadaakum min dooni Allahi in kuntum sadiqeena
Sahih International:
And if you are in doubt about what We have sent down upon Our Servant [Muhammad], then produce a surah the like thereof and call upon your witnesses other than Allah, if you should be truthful.
فَاِنۡ لَّمۡ تَفۡعَلُوۡا وَلَنۡ تَفۡعَلُوۡا فَاتَّقُوۡا النَّارَ الَّتِىۡ وَقُوۡدُهَا النَّاسُ وَالۡحِجَارَةُ ۖۚ اُعِدَّتۡ لِلۡكٰفِرِيۡنَ(البقرة :24)
Fain lam taf'aloo walan taf'aloo faittaqoo alnnara allatee waqooduha alnnasu waalhijaratu o'iddat lilkafireena
Sahih International:
But if you do not - and you will never be able to - then fear the Fire, whose fuel is men and stones, prepared for the disbelievers.
Complete Indexing of Quran Topics
We have indexed and found 2 verses about or related to (including the word(s)) "Revelation, if you are in doubt".
For your information, the verses as described above: