I saw the Messenger of Allah (ﷺ) praying both barefooted and wearing sandals.
Sunan Abi Dawud Book 2, Hadith 263
← Previous Hadith The Messenger of Allah (ﷺ) said: Act differently from the Jews, for they do not pray in their sandals or their shoes.

Sunan Abi Dawud Book 2, Hadith 262 Next Hadith → The Prophet (ﷺ) said: When any of you prays, he should not place his sandals on his right side or on his left so as to be on the right side of someone else, unless no one is at his left, but should place them between his feet.

Sunan Abi Dawud Book 2, Hadith 264