It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) forbade (certain things) and mentioned those qualities, then said: "Whoever lends a milch animal, it goes out in the morning with charity and returns in the evening with charity: its morning milk and its evening milk."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7800