According to Bernstein, Muhammad got into the business of trade through his family. Bernstein says that Muhammad was raised by an uncle of his, Abu Talib, who was a wealthy trader. We do not know for sure that he actually participated in the business, but it seems likely that he did. What we do know is that, when he was 25 or so, he started to work for a widow named Khadija, who ran a trading business of her own. He became her agent in Syria. Eventually, the two of them got married.