Imam Hossein (a.s.) saw a Muslim slave in a farm eating together with dog. On being questioned by the Imam Hossein (a.s.), the slave replied. "On account of my master who is a Jew and his taking very hard work from me, I remain sad due to bad treatment. But I take joy in feeding this dog with me with whatever I get to eat."
On hearing this, the Imam Hossein (a.s.) made contact with the Jew master and offered him 200 Ashrafi for the slave. The Jew was so much impressed by the Imam's generosity that he offered the slave to the Imam Hossein (a.s.) free of charge. Imam Hossein (a.s.) accepted the slave with a kind gesture and gave a gift of 200 Ashrafi to the slave boy and set him free. The wife of the Jew was watching all this and came forward and forgave her Meher money to her husband, the Jew. At this goodness of the wife the husband gave his wife the whole house and the farm as gift.
All this happened due to the kindness of the slave for feeding the dog from the same food that he was eating