Muwatta Malik #1859
Hair
Yahya related to me from Malik that Ziyad ibn Sad heard Ibn
Shihab say, "The Messenger of Allah, may Allah bless him and grant him
peace, let his hair hang down his forehead as Allah willed, and
afterwards he parted it."
Malik said, "There is no harm in a
man's looking at the hair of his son's wife or the hair of his wife's
mother."
About Muwatta Malik
This hadith is #1859 from Muwatta Malik, in the Book of Hair. Muwatta Malik contains 1,985 hadiths across 61 books.