'A'isha reported Allah's Apostle (ﷺ) saying: If a company of Muslims numbering one hundred pray over a dead person, all of them interceding for him, their intercession for him will be accepted.
Anas reported that Allah's Messenger (may peace he upon him) wed to make this supplication:" O Allah, I seek refuge in Thee from miserliness, from sloth and from decrepitude."
Hadith Referenceصحيح مسلم / كتاب الذكر والدعاء والتوبة والاستغفار / 2706
Anas bin Malik (RA) reported that Allah's Messenger (ﷺ) said: Dajjal is blind of one eye and there is written between his eyes the word "Kafir". He then spelled the word as k. f. r., which every Muslim would be able to read.
Hadith Referenceصحيح مسلم / كتاب الفتن وأشراط الساعة / 2933