Sayyiduna Mujammi' bin Jariyah (may Allah be pleased with him) narrates that he saw the Prophet (peace and blessings be upon him) praying in sandals.
Ahmad recorded it; its chain contains a narrator, Yazid bin Iyad, who is munkar al-hadith (his narrations are rejected).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2238