question #1 Sahih al-Bukhari 1260, Book 23, Hadith 21 : What is the significance of washing and braiding hair in Islamic funeral practices?

Um ‘Atiyya said that they had entwined the hair of the daughter of Allah’s Messenger (ﷺ) in three braids.
They first undid her hair, washed and then entwined it in three braids.”