Sahih al-Bukhari, Volume 7, Book 72, Hadith 741 (USC-MSA) ⓘ
Narrated Sa`id Abu Maslama: I asked Anas (bin Malik), "Did the Prophet use to offer the prayers with his shoes on?" He said, "Yes."
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا حَمَّادٌ، عَنْ سَعِيدٍ أَبِي مَسْلَمَةَ، قَالَ سَأَلْتُ أَنَسًا أَكَانَ النَّبِيُّ صلى الله عليه وسلم يُصَلِّي فِي نَعْلَيْهِ قَالَ نَعَمْ.
also referenced under: Book 77, Hadith 67 (In-Book) & Hadith 5850 (DarusSalam)