Hadees related to Kalima (Kalma)

Hudhaifah Radiyallahu 'anhu narrates that Rasulullah Sallallahu 'alaihi wasallam said: Islam will gradually fade as the design on cloth fades, until neither Siyam (fasting), nor Zakat (charity) nor Nusuk (religious devotion and sacrifice) will be known In a certain
night the Qur'an will be lifted from the hearts of men leaving not a single verse on the earth, and only a few groups of people wil remain, of old men and old women, saying: We found our forefathers reciting the Kalimah La ilaha illallah, so we are reciting it Silah
ibne-Zufr said to Hudhaifah Radiyallahu 'anhu: How will their saving of La ilaha illallah benefit them when they neither know Siyam, nor Zakat, nor Nusuk? Hudhaifah Radiyallahu 'anhu evaded him So he repeated his question thrice, each time Hudhaifah evaded him Then, after the third time, he turned and faced him saying:Silah! It will indeed save them from the Fire.(Mustadrak Hakim)