Sahih al-Bukhari 7296
Sahih al-Bukhari · Book 96: Holding Fast to the Qur'an and Sunnah · Asking too many questions and troubling with what does not concern one
Narrated Anas bin Malik:
حَدَّثَنَا الْحَسَنُ بْنُ صَبَّاحٍ ، حَدَّثَنَا شَبَابَةُ ، حَدَّثَنَا وَرْقَاءُ ، عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ الرَّحْمَنِ ، سَمِعْتُ أَنَسَ بْنَ مَالِكٍ ، يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لَنْ يَبْرَحَ النَّاسُ يَتَسَاءَلُونَ حَتَّى يَقُولُوا هَذَا اللَّهُ خَالِقُ كُلِّ شَىْءٍ فَمَنْ خَلَقَ اللَّهَ " .
Allah's Messenger (ﷺ) said, "People will not stop asking questions till they say, 'This is Allah, the Creator of everything, then who created Allah?' "