Abu saeed al-Khudri said: The mark of earth was seen on the forehead and nose of the Messenger of Allah ﷺ due to the prayer in which he led the people.
Hadith Referenceسنن ابي داود / أبواب تفريع استفتاح الصلاة / 894
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (813) صحيح مسلم (1167)