Muhammad does not ask his followers to give money to the poor, instead he asks them to pay the poor tax. This raises the possibility that he was collecting some of the charity for the poor for himself.
[2.43] And keep up prayer and pay the poor-rate and bow down with those who bow down.
[19.31] And He has made me blessed wherever I may be,
and He has enjoined on me prayer and poor-rate so long as I live;
[27.3] Who keep up prayer and pay the poor-rate, and of
the hereafter, they are sure.
[31.4] Those who keep up prayer and pay the poor-rate and they are certain of the hereafter.
[58.13] Do you fear that you will not (be able to) give in charity before your consultation? So when you do not do it and Allah has turned to you (mercifully), then keep up prayer and pay the poor-rate