This excerpt is taken from Sheikh Zubair Ali Zai Rahimahullah's book on the rulings and issues of Qurbani.
Cow's Milk and Meat:
Sayyiduna Abdullah bin Mas'ud رضي الله عنه says that the Messenger of Allah صلی اللہ علیہ وسلم said:
إن الله تعالى لم ينزل داء إلا أنزل له شفاء إلا الهرم فعليكم بألبان البقر فإنها ترم من كل شجر
"Indeed, Allah Almighty has not sent down any disease for which He has not sent down a cure, except for old age. So hold firmly to the milk of cows, for it grazes on every herb."
Reference: (Mustadrak Hakim: 4/197, Hadith 7425, and its chain is authentic)
❀ He further said:
في ألبان البقر شفاء من كل داء
"There is a cure for every disease in cow's milk."
Reference: (Mustadrak Hakim: 4/196, Hadith 7424, and its chain is good)
The Messenger of Allah صلی اللہ علیہ وسلم slaughtered cows from among his wives.
Reference: (Sahih Bukhari: 5559, Sahih Muslim: 1211)
