So Warn of the Day of Judgement, When God will Remove the Mountains, and you will See the Earth as a Flat Plain
You will Not See Any Curve, and those who Mocked will be Enveloped by what they used to Ridicule
20:105 - 107, Qur'an
[So] they ask you about the mountains, so say, "My Lord will blow them away with a blast. And He will leave [the earth] a flat plain; you will not see any crookedness or any curve therein" -
69:13 - 15, Qur'an
[It will be on the Day] when the Trumpet is blown with one blast and the earth and the mountains are lifted and leveled [flat] with one blow - then on that Day, the Event will occur -
56:2 - 6, Qur'an
There is no denial at its occurrence. It will bring down [some] and raise up [others]. When the earth is shaken with convulsion and the mountains are broken down, crumbling, and become dispersing dust.
85:19, Qur'an
But those who disbelieve are in [persistent] denial -
[For they say,] "What is important about the flat-earth statements within the Qur'an is that here we have hard irrefutable proof that this book is not authored by a god and contains stuff that is factually wrong." - skeptical-science.com
84:3, Qur'an
[It will be on the Day] when the earth has been flattened out -
52:10 - 12, Qur'an
[When] the mountains will pass on, departing - then woe to the deniers that Day, who are in [empty] discourse amusing themselves.
83:29 - 33, Qur'an
[And] indeed, those who committed crimes used to laugh at those who believed. And when they passed by them, they would exchange derisive glances. And when they returned to their people, they would return jesting. And when they saw them, they would say, "Indeed, those are truly lost."
89:21, Qur'an
No! When the earth has been leveled [flat] - pounded and crushed -
88:20 - 22, Qur'an
[Then do they not look] at the earth - how it is spread out [flat as a carpet spread around]? So remind, you are only a reminder. You are not a controller over them -