Shaikh Sadooq and others narrate that in Madina a person from the progeny of Caliph Umar ibne Khattab frequently troubled Imam Moosa-al-Kazim (a.s.). He insulted Imam (a.s.) and whenever he faced him, he would start abusing Imam Ali (a.s.). One day a person told Imam-al-Kazim (a.s.) that, “If you permit us we will kill this evil and unchaste man.” The Imam (a.s.) was infuriated and told them not to take such a step. Imam (a.s.) then inquired as to where would he find that person now. They told Him that he had a field near Madina and would be there at that moment. Imam Moosa-al-Kazim (a.s.) sat on his mule and proceeded to meet him. He entered the field mounted on his mule. The person saw him coming and shouted, “Do not spoil my field.” Imam (a.s.) advanced further and went and sat near him and started talking to him. Imam then asked him as to how much he spent on his field. He replied that he had spent a hundred Ashrafis. Then Imam (a.s.) asked him as to how much gain he expected from it. He said that he did not have knowledge of the unseen, to which Imam (a.s.) said
“Should I tell you how much you expect.”
The man replied, “I expect two hundred Ashrafis yield.” Imam removed a bag containing three thousand Ashrafis and handing it to him said,
“Take this, for your field still needs proper ploughing. Almighty Allah will surely give you sustenance till you are alive.”
The man kissed the forehead of Imam (a.s.) and requested Him to forgive his bad attitude. The Imam (a.s.) smiled and returned home. From that day onwards people saw him coming to the mosque daily, and whenever he looked at Imam Moosa-al-Kazim (a.s.), he would say:
Allah best knows where He places His message (Surah-al-An’am: 125).
His companions asked him as to what was the reason for this sudden change. To which he replied, “Till now you have listened to what (bad) I said, and from now on listen to me what (good) I say.” Then he started praising Imam (a.s.), on hearing this his companions started fighting with him and he defended his claim.
Imam turned towards His companions and said,
“Whatever you wished about this man (to kill him) was appropriate or what I did is right? In exchange of some money I bought his friendship and ended his enmity (by favouring him).”