Sahl bin Mu'adh al-Juhani narrates from his father (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever gives up such clothing out of humility for Allah, the Mighty and Majestic, despite being able to afford it, Allah Almighty will call him on the Day of Resurrection before all of creation and give him the choice to wear whichever of the garments of faith he wishes."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6101