It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that he said: Islam will be worn away (from people's hearts and lives) just as the patterns of an old garment wear away, until people will not even know what the rulings of prayer, fasting, and sacrifice and Hajj are. Only old men and old women will say: We found our elders saying "La ilaha illallah" (There is no god but Allah), so we say it too. Silah bin Zufar asked him: "O Hudhayfah! When they know nothing of prayer, nor fasting, nor Hajj and sacrifice, what benefit will 'La ilaha illallah' be to them?" Sayyiduna Hudhayfah (may Allah be pleased with him) said: "O Silah! Do you not know that this very testimony will save them from the fire of Hell?!" This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it.