praying forty salah continuously in Masjid-un-Nabi (Prophet’s mosque) has virtues that this will be a source of salvation from punishment and hellfire and deliverance from Nifaq ((hypocrisy).
من صلی فی مسجدی اربعین صلاۃ لاتفوتہ صلاۃ کتب لہ براءۃ من النار و براءۃ من العذاب و براءۃ من النفاق۔ (مسند أحمد)
What about above mentioned hadith level? shahih/hasan/daif/maouzoo?
Answer:
Ref. No. 41/981
In the name of Allah the most Gracious the most merciful
The answer to your question is as follows:
The above mentioned hadith is a weak hadith (daeef) but as per the rules of Muhaddithin it is reliable in the chapter of fazail.
And Allah knows best
Darul Ifta
Darul Uloom Waqf Deoband