Sahih Al Bukhari Hadith Number 1256

Narrated Um ‘Atiyya: When we washed the deceased daughter of the Prophet, he said to us, while we were washing her, “Start the bath from the right side and from the parts which are washed in ablution.”

23  Funerals (Al-Janaa’iz)
Hadith number 1256
Volume no 2
Chapter: 11 ((To start with) the parts of the dead body which are washed in ablution)