Sahih Muslim , Book 1, Hadith 334 (USC-MSA) ⓘ
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 .
also referenced under: Book 1, Hadith 343 (In-Book) & Hadith 176 (Reference)