Al-Adab Al-Mufrad, Hadith 974 ⓘ
Anas was asked, "Did you touch the Prophet, may Allah bless him and grant him peace, with your hand?" He replied, "Yes," so they kissed it.
حَدَّثَنَا عَبْدُ اللهِ بْنُ مُحَمَّدٍ، قَالَ: حَدَّثَنَا ابْنُ عُيَيْنَةَ، عَنِ ابْنِ جُدْعَانَ، قَالَ ثَابِتٌ لأَنَسٍ: أَمَسَسْتَ النَّبِيَّ صلى الله عليه وسلم بِيَدِكَ؟ قَالَ: نَعَمْ، فَقَبَّلَهَا.
also referenced under: Book 42, Hadith 10 (In-Book) & Book 42, Hadith 974 (English)