Chapter 40: Representation, Authorization, Business by Proxy
Narrated 'Aisha: I twisted the garlands of the Hadis (i. e. animals for sacrifice) of Allah' s Messenger (ﷺ) with my own hands.
Then Allah' s Messenger (ﷺ) put them around their necks with his own hands, and sent them with my father
(to Mecca). Nothing legal was regarded illegal for Allah' s Messenger (ﷺ) till the animals were slaughtered.
Sahih al-Bukhari 2317