question #1 Sahih Muslim 685a, Book 6, Hadith 1 : How did the number of rak’ahs in prayer change for residents compared to travelers?

The prayer was prescribed as two rak’ahs, two rak’ahs both in journey and at the place of residence. The prayer while travelling remained as it was (originally prescribed), but an addition was made in the prayer (observed) at the place of residence.