From Sahih Bukhari (Hadith 5608):
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "The best object of charity is a she-camel which has (newly) given birth and gives plenty of milk, or a she-goat which gives plenty of milk; and is given to somebody to utilize its milk by milking one bowl in the morning and one in the evening
Reference: Bukhari 5608