The word "La ilaha illa Allah" will save people from the Fire

It is narrated from Sayyiduna Hudhayfah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Islam will wear out and fade away just as the embroidery of a garment fades, until it will no longer be known what fasting, charity and the sacrifice of Hajj and Umrah are. The Book of Allah, the Mighty and Majestic, will be taken away in a single night, so that not a single verse of it will remain on the earth. Some groups of people will remain, among them old men and old women, who will say: We found our forefathers upon this word, 'La ilaha illallah' (there is no god but Allah), so we too say it." At this Silah asked him: When they will not even know about fasting, charity and sacrifice, of what use will this word 'La ilaha illallah' be to them? Sayyiduna Hudhayfah (may Allah be pleased with him) turned away from him. Silah asked again, until he asked a third time, and then he turned towards Silah and said: O Silah! This word will save them from the Fire; it will protect them from the Fire; it will deliver them from the Fire of Hell.
This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the (major) signs (of the Hour) have passed except four: the Dajjal, the Beast of the earth (Dabbat al-Ard), Gog and Magog (Ya'juj and Ma'juj), and the rising of the sun from the west; and the sign with which (the door of deeds) will be sealed upon the sun. Then he recited this verse: "Are they waiting for nothing except that the angels should come to them?" [Surah al-An'am: 158]
The chain of this hadith is sahih (authentic), but the two Shaykhs (Bukhari and Muslim) did not record it.