Preparing Equipment for Jihad - Section 2 Mishkat al-Masabih 3886
Arabic hadith text
وَعَن السَّائِب بْنِ يَزِيدَ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ عَلَيْهِ يَوْمَ أُحُدٍ دِرْعَانِ قَدْ ظَاهَرَ بَيْنَهُمَا. رَوَاهُ أَبُو دَاوُدَ وَابْنُ مَاجَهْ
Translation
As-Sa’ib b. Yazid told that the Prophet wore two coats of mail at the battle of Uhud as a double protection. Abu Dawud and Ibn Majah transmitted it.