Wash her (his daughter) three, five or more times with water and Sidr and sprinkle camphor on her at the end; and when you finish, notify me.” So when we finished, we informed him ( to the Prophet) and he (Prophet pbuh) gave us his waist-sheet and told us to shroud her in it. Aiyub said that Hafsa narrated to him a narration similar to that of Muhammad in which it was said that the bath was to be given for an odd number of times, and the numbers 3, 5 or 7 were mentioned. It was also said that they were to start with the right side and with the parts which were washed in ablution, and that Um ‘Atiyya also mentioned, “We combed her hair and divided them in three braids.”
Narrated Hafsa bint Seereen:
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.”
Sahih al-Bukhari 1260
Narrated Um ‘Atiyya:
One of the daughters of the Prophet ( Muhammad saws) expired and he (Prophet Muhammadﷺ) came to us and said, “Wash her with Sidr (water) for odd number of times, i.e. three, five or more, if you think it necessary, and in the last, put camphor or (some camphor on her), and when you finish, notify me.” So when we finished we informed him. He (Prophet Muhammad ﷺ) gave his waist-sheet to us (to shroud her). We entwined the hair (of the deceased girl) in three braids and made them fall at her back.
Sahih al-Bukhari 1263
In-book : Book 23, Hadith 25