 After Muhammad started his preaching in 610 CE, his relationship with his own tribesmen, the Quraysh people, deteriorated gradually.Despite this, the Quraysh people of Mecca used to deposit their valuable things at Muhammad because of his honesty and trustworthiness.When Muhammad was compelled to leave Mecca because of Quraysh opposition, he directed his cousin Ali to return those deposits at their due recipients after his leave.