question #1 Sahih al-Bukhari 350, Book 8, Hadith 2 : How did the number of rak’ahs in prayers change for travelers and non-travelers according to Islamic teachings?

the mother of believers: Allah enjoined the prayer when He enjoined it, it was two rak`at only (in
every prayer) both when in residence or on journey. Then the prayers offered on journey remained the
same, but (the rak`at of) the prayers for non-travelers were increased.