A person who offers forty prayers consecutively in my Masjid (Masjid Nabawi), without missing a prayer in between, will secure immunity from the fire of Hell, and from other punishments and also from hypocrisy. (Musnad e Ahmad – Musnad Anas Bin Malik, Hadith No. 12583)
what is the standard(sahih/hasan/dhaif) of the above mentioned hadith in regards of sanad and maton(text)?