A Sydney cabbie who raped three female passengers is an "honest, caring person who would not harm a soul", a judge has been told.

Fatima Kazan also said her brother-in-law, Hassan Nagi, was "very, very sorry" for his offences.

Raped three women ... Hassan Nagi. Credit:Kate Geraghty

She was giving evidence in the Downing Centre District Court on Wednesday at the sentencing hearing of Nagi, 37, of Bexley.

Nagi has pleaded guilty to raping three women, aged 31, 23, and 27, in 2003, 2006 and 2007.