كتاب الإيمان
1  
The Book of Faith
(77)
Chapter: The Meaning of the Saying of Allah, The Mighty and Sublime: And indeed he saw him at a second descent (another time)"; And did the prophet (saws) see his lord on the night of the Isra?
(77)
باب مَعْنَى قَوْلِ اللَّهِ عَزَّ وَجَلَّ: {وَلَقَدْ رَآهُ نَزْلَةً أُخْرَى} وَهَلْ رَأَى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ رَبَّهُ لَيْلَةَ الإِسْرَاءِ
Sahih Muslim 176 a

It is narrated on the authority of Ibn 'Abbas that he (the Holy Prophet) saw (Allah) with, his heart.

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا حَفْصٌ، عَنْ عَبْدِ الْمَلِكِ، عَنْ عَطَاءٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ رَآهُ بِقَلْبِهِ ‏.‏
Reference : Sahih Muslim 176a
In-book reference : Book 1, Hadith 341
USC-MSA web (English) reference : Book 1, Hadith 334
  (deprecated numbering scheme)