Quran(15:9) “We have sent down the Reminder (Quran) and We will preserve it”
Quran (11:13-14) “Or do they say: “He has invented it”? Say: “Then produce ten invented surahs like this and call upon anyone you can besides Allah, if you are telling the truth.” If they do not respond to you, then know that it has been sent down with Allah’s knowledge,,,”
Quran(10:38-39) Do they say:”He has invented it”? Say: “Then produce a surah like it and
call on anyone you can besides Allah, if you are telling the truth.”