Question

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 1

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