Abu Hurayrah reports:
Rasulullah Sayyidina Rasulullah sallallahu alaihe wasallam said: One should not wear one shoe and walk. Both shoes should be worn or both shoes should be removed. (RU)
English reference (RU): Book 10, Hadith 77 (RU)
Arabic reference (RU): Book 11, Hadith 81 (RU)