Hazrat Shu'aib bin Habhab narrates that I was with Hazrat Ali (may Allah be pleased with him) bin Abdullah al-Barqi when a Jew or a Christian passed by us who was carrying a load of food. Hazrat Ali (may Allah be pleased with him) greeted him with Salam. Upon this, Hazrat Shu'aib says that I said: He is a Jew or a Christian! So Hazrat Ali (may Allah be pleased with him) recited the last part of Surah Zukhruf. Translation: By the saying of the Messenger, "O Lord, these are a people who do not believe, so turn away from them and say, 'Peace.' Soon they will know."