Sayyiduna Uthman bin Affan (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "Whoever's feet become dusty in the path of Allah, Allah Almighty will make him forbidden to Hell." The narrator says: I never saw more people walking on foot than on that day; at that time we were beyond the passes (al-Durub).
Abu Ya'la recorded it in al-Kabir, and al-Bazzar recorded it; its chain contains Muhammad bin Abdullah bin Ubayd bin Umayr, who is matruk (abandoned).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجهاد / 9477