‏الصلاة : Hadeeth No:1463 Ibn 'Abbas reported: Allaah has prescribed the prayer through the word of your Prophet (sallAllaahu alayhi wa sallam) as four rak'ahs when resident, two when travelling, and one when danger is present....

‏الفتن وأشراط الساعة‏ : Hadeeth No:7022 This hadith has been narrated on the authority of Isma'il through other chains of transmitters with a slight variation of wording....