وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ لاَ يَمْشِيَنَّ أَحَدُكُمْ فِي نَعْلٍ وَاحِدَةٍ لِيُنْعَلْهُمَا جَمِيعًا أَوْ لِيُحْفِهِمَا جَمِيعًا ‏"‏ ‏.‏

Yahya related to me from Malik from Abu'z-Zinad from al-Araj fromAbu Hurayra that the Messenger of Allah, may Allah bless him and granthim peace, said, "Do not wear one sandal. Wear both of them or go withboth feet bare." Translation Not Available

Book Ref: Muwatta Imam Malik Book 48 Hadith 1668
Web Ref:  Muwatta Imam Malik Book 48 Hadith 14