Silsilat al-Ahadith al-Sahihah

Zuhair bin Muawiyah narrates from his wife, who heard from Malika bint Umar. The narrator also mentioned that during the caliphate of Sayyiduna Umar bin Khattab (may Allah be pleased with him), the owners were given back their goats. In any case, Malika suggested to her (the use of) cow's ghee for some ailment (as a remedy) and said that the Messenger of Allah (peace and blessings be upon him) said: "The milk of cows is a cure, their ghee is medicine, and their meat is disease."