The umm walad (slave mother) of Ibrahim bin Abd al-Rahman bin Awf (may Allah have mercy on her) relates that she asked Sayyidah Umm Salamah (may Allah be pleased with her), saying: I am a woman who keeps her hem long, and I walk through dirty places. Sayyidah Umm Salamah (may Allah be pleased with her) said: The Messenger of Allah (peace and blessings be upon him) said: "The (clean ground) after it purifies it."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20147