Sunan Ibn Majah, Hadith 3617 ⓘ
It was narrated from Abu Hurairah that the Messenger of Allah said; “None of you should walk in one sandal or in one leather sock. Let him take them both off or walk in both of them.”
حَدَّثَنَا أَبُو بَكْرٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، عَنِ ابْنِ عَجْلاَنَ، عَنْ سَعِيدِ بْنِ أَبِي سَعِيدٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ يَمْشِي أَحَدُكُمْ فِي نَعْلٍ وَاحِدٍ وَلاَ خُفٍّ وَاحِدٍ لِيَخْلَعْهُمَا جَمِيعًا أَوْ لِيَمْشِ فِيهِمَا جَمِيعًا " .
also referenced under: Book 32, Hadith 3748 (In-Book) & Volume 4, Book 32, Hadith 3617 (DarusSalam)