reflect credit on
reflect credit on (someone, something, or oneself)
To demonstrate that someone, something, or oneself is worthy or deserving of credit. The achievements of your pupils on their exams reflects credit on your abilities as a teacher. I must say that the exemplary manners and good behavior of these children reflects credit on their parents. Between her impressive résumé and the way she handled herself during her interview, I have to say that she reflected a lot of credit on herself.
reflect credit (up)on someone or something
[for some act] to bring credit to someone or something. (Upon is formal and less commonly used than on.) Your efforts really reflect credit upon you. Mary's success really reflected credit on the quality of her education.