Do somebody credit
Definition 1 of 2
Pro Tip 1/3Positive Actions
Use when someone's actions show good character or morals. 
Peter volunteers every weekend, which really does him credit.
Pro Tip 2/3Praise Others
Highlight someone's positive qualities to complement them. 
She worked tirelessly to organize the charity event, which does her credit.
Pro Tip 3/3Not for Self
It's used by others as recognition, not self-praise. 
His colleagues said the success of the project does him credit.