Narrated Ibn 'Umar (RA):

Allah's Messenger (ﷺ) said: "The prayer in time of danger is one Rak'ah, in whatever manner it is (performed)." [al-Bazzar reported it through a weak chain of narrators].

وَعَنِ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: قَالَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-{ صَلَاةُ اَلْخَوْفِ رَكْعَةٌ عَلَى أَيِّ وَجْهٍ كَانَ } رَوَاهُ اَلْبَزَّارُ بِإِسْنَادٍ ضَعِيفٍ [1]‏ .‏