حَدَّثَنَا الْقَاسِمُ بْنُ مَالِكٍ الْمُزَنِيُّ أَبُو جَعْفَرٍ عَنْ أَيُّوبَ بْنِ عَائِذٍ عَنْ بُكَيْرِ بْنِ الْأَخْنَسِ عَنْ مُجَاهِدٍ عَنِ ابْنِ عَبَّاسٍ قَالَ إِنَّ اللَّهَ عَزَّ وَجَلَّ فَرَضَ الصَّلَاةَ عَلَى لِسَانِ نَبِيِّكُمْ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي الْحَضَرِ أَرْبَعًا وَفِي السَّفَرِ رَكْعَتَيْنِ وَفِي الْخَوْفِ رَكْعَةً
مسند امام احمد بن حنبل · Hadith 2177
It was narrated that Ibn 'Abbas (RA) said: Allah, may He be glorified and exalted, enjoined prayer on the lips of your Prophet (PBUH): when not travelling, four rak'ahs ; when travelling, two rak'ahs; and at times of fear, one rak'ah.
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020