´It was narrated that Ibn 'Abbas said:` "The Salah was enjoined on the lips of the Prophet (ﷺ), four Rak'ahs while resident, and two while traveling, and one Rak'ah during times of fear."
Hadith Referenceسنن نسائي / كتاب الصلاة / 457
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم
´It was narrated that Ibn 'Abbas said:` "The prayer of the resident was enjoined on the tongue of your Prophet (ﷺ), four (rak'ahs), and the prayer of the traveler is two rak'ahs, and the prayer of fear is one rak'ah."
Hadith Referenceسنن نسائي / كتاب تقصير الصلاة فى السفر / 1442
´It was narrated that Ibn 'Abbas said:` "Allah, the Mighty and Sublime, enjoined the prayer on the tongue of your Prophet (ﷺ): While a resident four (rak'ahs), while traveling two, and at times of fear one."
Hadith Referenceسنن نسائي / كتاب تقصير الصلاة فى السفر / 1443
´It was narrated that Ibn Abbas said:` "Allah (SWT) enjoined the prayer on the tongue of your Prophet (ﷺ): four (rak'ahs) while a resident, two rak'ahs while traveling, and one rak'ah during times of fear."
Hadith Referenceسنن نسائي / كتاب صلاة الخوف / 1533