Ruling on a person who finds a lost cow

Question 9: A man sold a cow to a person whom he does not know. The cow escaped and returned to him again. Since he does not know the purchaser, he sold it again and spent its price. What should he do?

Answer: The ruling on this cow is the same as the ruling of the Luqatah (a lost item found by someone other than its owner)… read more here.