(3) باب كَيْفَ فُرِضَتِ الصَّلاَةُ .
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." (FR)
Reference (FR): Sunan an-Nasa'i 456 (FR)
In-book reference (FR): Book 5, Hadith 9 (FR)
English translation (FR): Vol. 1, Book 5, Hadith 457 (FR)