Muwatta Malik #829
Hajj
Yahya related to me from Malik from Alqama ibn Abi Alqama that
his mother said, "I heard A'isha, the wife of the Prophet, may Allah
bless him and grant him peace, being asked whether some one in ihram
could scratch their body or not, and she said, 'Yes, he can scratch it
and do so as hard as he pleases. I would scratch even if my hands were
tied and I could only use my feet.' "
About Muwatta Malik
This hadith is #829 from Muwatta Malik, in the Book of Hajj. Muwatta Malik contains 1,985 hadiths across 61 books.