Al-Kāfi - Volume 6 > The Milk Products from Cows
Hadith #3

مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ أَبِي نَصْرٍ عَنْ أَبَانِ بْنِ عُثْمَانَ عَنْ زُرَارَةَ عَنْ أَحَدِهِمَا ( عليهما السلام ) قَالَ قَالَ رَسُولُ اللَّهِ ( صلى الله عليه وآله ) عَلَيْكُمْ بِأَلْبَانِ الْبَقَرِ فَإِنَّهَا تُخْلَطُ مَعَ كُلِّ الشَّجَرِ .

3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ahmad ibn Muhammad from ibn abu Nasr from Aban ‘Uthman from Zurarah who has said the following: “One of the two Imam, (abu Ja‘far or abu ‘Abd Allah), ‘Alayhim al-Salam, has said that the Messenger of Allah, O Allah, grant compensation to Muhammad and his family worthy of their services to Your cause, has said, ‘You must drink cow milk; it mixes with every tree.’”