question #1 Sahih al-Bukhari 779, Book 10, Hadith 174 : How did the Prophet (ﷺ) vary the length of the rak’ahs in the Zuhr prayer?

My father said, “The Prophet (ﷺ) used to prolong the first rak`a of the Zuhr prayer and shorten the second
one and used to do the same in the Fajr prayer.”