Abu Dharr (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him); then he mentioned the hadith in which he (peace and blessings be upon him) said: "Any man who dies and leaves behind goats, camels or cows on which he did not pay zakah, they will come to that man fat and robust, trample him with their hooves and butt him with their horns, until judgement is passed among the people. Then the first of them (the animals) will return again upon the last (that is, when the last animal has passed, the first will come again)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قسم الصدقات / 13124