Yazid bin Abi Maryam (may Allah have mercy on him) says: I was walking to Jumu'ah when Abayah bin Rifa'ah bin Rafi' bin Khadij (may Allah have mercy on him) met me on the way, and he was riding. He said: Count these steps of yours as being in the path of Allah, for I heard Abu Abs bin Jabr al-Ansari (may Allah be pleased with him) say that the Prophet (peace and blessings be upon him) said: "Whoever's feet become dusty in the path of Allah, Allah will make those feet forbidden to Hell."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5876