I asked Anas bin Malik, "Did the Messenger of Allah ﷺ pray in his sandals?"He replied, "Yes."
حدثنا عباد بن عباد وغسان بن مضر
قلت لأنس بن مالك أكان رسول الله ﷺ يصلي في نعليه قال نعم
Its isnad is sahih. Abbad bin Abbad bin Habib Azdi is trustworthy, his hadith appears in the collections of the group, and Ghassan bin Mudar Basri, known as al-Makfuf, is also trustworthy. The hadith was narrated by Bukhari 1/494 no. 386 (Fath), Muslim 1/391 no. 555, Abu Dawud 1/175 no. 648, and Tirmidhi 2/74 no. 775, and it has already been mentioned under Abu Hurairah.