Sayyiduna Abu Bakrah (may Allah be pleased with him) narrates: I saw the Prophet (peace and blessings be upon him) praying in sandals.
Abu Ya'la and al-Bazzar recorded it; its chain contains a narrator, Bahr bin Marrar, who is one of those who suffered from ikhtilat (deterioration of memory). Yahya bin Ma'in declared him thiqah (trustworthy). In the chain of Abu Ya'la there is a narrator, Abd al-Rahman bin Uthman Abu Bahr, whom Imam Ahmad and a group (of scholars) declared weak; Yahya bin Sa'id al-Qattan held a good opinion of him and narrated hadith from him.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2245