Sahih al-Bukhari, Volume 9, Book 93, Hadith 477 (USC-MSA) ⓘ
Narrated Masruq: `Aisha said, "If anyone tells you that Muhammad has seen his Lord, he is a liar, for Allah says: 'No vision can grasp Him.' (6.103) And if anyone tells you that Muhammad has seen the Unseen, he is a liar, for Allah says: "None has the knowledge of the Unseen but Allah."
حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، حَدَّثَنَا سُفْيَانُ، عَنْ إِسْمَاعِيلَ، عَنِ الشَّعْبِيِّ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ مَنْ حَدَّثَكَ أَنَّ مُحَمَّدًا صلى الله عليه وسلم رَأَى رَبَّهُ فَقَدْ كَذَبَ وَهْوَ يَقُولُ {لاَ تُدْرِكُهُ الأَبْصَارُ} وَمَنْ حَدَّثَكَ أَنَّهُ يَعْلَمُ الْغَيْبَ فَقَدْ كَذَبَ، وَهْوَ يَقُولُ لاَ يَعْلَمُ الْغَيْبَ إِلاَّ اللَّهُ.
also referenced under: Book 97, Hadith 10 (In-Book) & Hadith 7380 (DarusSalam)