Narrated Al-Bara: A man whose face was covered with an iron mask (i.e. clad in armor) came to the Prophet and said, O Allah's Apostle! Shall I fight or embrace Islam first? The Prophet said, Embrace Islam first and then fight. So he embraced Islam, and was martyred. Allah's Apostle said, A Little work, but a great reward. (He did very little (after embracing Islam), but he will be rewarded in abundance).