Sunan Abi Dawud 4721
سنن أبي داود#4721SahihAbu Hurairah reported to the Messenger of Allah( may peace be upon him) as sayings:People will continue to ask one another(questions) till this is pronounced: Allah created all things, but who created Allah ? Whoever comes across anything of that, he should say: I believe in Allah
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (3276) Sahih Muslim (134)
In-book reference: 42:126