question #1 Sahih Muslim 685b, Book 6, Hadith 2 : How did the number of rak’ahs in prayer change for residents and travelers according to Islamic teachings?

‘A’isha, the wife of the Messenger of Allah (ﷺ), said Allah prescribed the prayer as two rak’ahs, then it was completed (to four rak’ahs) at the place of residence, but was retained in the same position in journey as it was first made obligatory.