If any of you treads with his shoes on something unclean, they will be purified with the earth
Authentic hadithعن أبي هريرة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : «إذا وَطِئَ الأَذَى بِخُفَّيْه، فَطَهُورُهُمَا التُّرَاب».
Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said: "If any of you treads with his shoes on something unclean, they will be purified with the earth."
Explanation
If a person wears a pair of leather socks, sandals, shoes, or any footwear, and he happens to step on something impure, and then he continues walking with the impure footwear on a pure place, or he rubs it with dust, his footwear will thus become pure, and he may pray while wearing it.
Source · Narrated by Abu Daoud
From the Hadith Encyclopedia (hadeethenc.com).