Hadith 1:156
Ahmad transmitted on the authority of `Ali (RAA):
"The earth (dust) has been made for me as a means for purification."
وَعَنْ عَلِيٍّ - رضى الله عنه - عِنْدَ أَحْمَدَ: { وَجُعِلَ اَلتُّرَابُ لِي طَهُورًا } (155)
Original Reference: Bulugh al-Maram 128