Narrated as-Saib ibn Yazid: as-Saib reported on the authority of a man whom he named: The Messenger of Allah ﷺ put on two coats of mail during the battle of Uhud as a double protection. (The narrator is doubtful about the word zahara or labisa. )
Hadith Referenceسنن ابي داود / كتاب الجهاد / 2590
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح, مشكوة المصابيح (3886), وللحديث شاھد عند الترمذي (3738)
Hadith Takhrij« سنن ابن ماجہ/الجہاد 18 (2806)، (تحفة الأشراف: 15577)، وقد أخرجہ: مسند احمد (3/449) (صحیح) »
Benefits and Issues: Life and death are in the hands of Allah. However, for the purpose of protection, carrying weapons and wearing armor, etc., is legislated. And this is not contrary to tawakkul (reliance upon Allah).
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2590