حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، عَنْ أَبِي مَالِكٍ الأَشْجَعِيِّ، عَنْ رِبْعِيِّ بْنِ حِرَاشٍ، عَنْ حُذَيْفَةَ بْنِ الْيَمَانِ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏"‏ يَدْرُسُ الإِسْلاَمُ كَمَا يَدْرُسُ وَشْىُ الثَّوْبِ حَتَّى لاَ يُدْرَى مَا صِيَامٌ وَلاَ صَلاَةٌ وَلاَ نُسُكٌ وَلاَ صَدَقَةٌ وَلَيُسْرَى عَلَى كِتَابِ اللَّهِ عَزَّ وَجَلَّ فِي لَيْلَةٍ فَلاَ يَبْقَى فِي الأَرْضِ مِنْهُ آيَةٌ وَتَبْقَى طَوَائِفُ مِنَ النَّاسِ الشَّيْخُ الْكَبِيرُ وَالْعَجُوزُ يَقُولُونَ أَدْرَكْنَا آبَاءَنَا عَلَى هَذِهِ الْكَلِمَةِ لاَ إِلَهَ إِلاَّ اللَّهُ فَنَحْنُ نَقُولُهَا ‏"‏ ‏.‏ فَقَالَ لَهُ صِلَةُ مَا تُغْنِي عَنْهُمْ لاَ إِلَهَ إِلاَّ اللَّهُ وَهُمْ لاَ يَدْرُونَ مَا صَلاَةٌ وَلاَ صِيَامٌ وَلاَ نُسُكٌ وَلاَ صَدَقَةٌ فَأَعْرَضَ عَنْهُ حُذَيْفَةُ ثُمَّ رَدَّهَا عَلَيْهِ ثَلاَثًا كُلَّ ذَلِكَ يُعْرِضُ عَنْهُ حُذَيْفَةُ ثُمَّ أَقْبَلَ عَلَيْهِ فِي الثَّالِثَةِ فَقَالَ يَا صِلَةُ تُنْجِيهِمْ مِنَ النَّارِ ‏.‏ ثَلاَثًا ‏.‏

It was narrated from Hudhaifah bin Yaman that the Messenger of Allah(PBUH) said: “Islam will wear out as embroidery on a garment wearsout, until no one will know what fasting, prayer, (pilgrimage) ritesand charity are. The Book of Allah will be taken away at night, andnot one Verse of it will be left on earth. And there will be somepeople left, old men and old women, who will say: “We saw ourfathers saying these words: ‘La ilaha illallah’ so we say themtoo.” Silah said to him: “What good will (saying): La ilahaillallah do them, when they do not know what fasting, prayer,(pilgrimage) rites and charity are?” Hudhaifah turned away fromhis. He repeated his question three times, and Hudhaifah turned awayfrom him each time. Then he turned to him on the third time and said:“O Silah! It will save them from Hell,” three times. Translation Not Available

Book Ref: Sunan Ibn Majah Book 36 Hadith 4049
Web Ref:  Sunan Ibn Majah Vol 5 Book 36 Hadith 4049