pride oneself on - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Also, take pride in. Be proud of, take satisfaction in, as in We pride ourselves on always being punctual, or She took pride in her flower garden. The first term dates from the late 1300s, the second from the late 1500s.