Sunan Abi Dawud 4603
سنن أبي داود#4603SahihNarrated AbuHurayrah: The Prophet (ﷺ) said: Controverting about the Qur'an is disbelief
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih
Muhammad Muhyi Al-Din Abdul HamidHasan Sahih
Shuaib Al ArnautHasan
Zubair Ali ZaiIsnaad Hasan
In-book reference: 42:8