keep faith with somebody/something
From Longman Dictionary of Contemporary Englishkeep faith with somebody/somethingkeep faith with somebody/somethingBELIEVEto continue to support or believe in a person, organization, or idea → faithExamples from the Corpuskeep faith with somebody/something• Moxon's decision to drop Ashley Metcalfe and keep faith with Simon Kellett turned out to be fully justified.• He had kept faith with the Old Man and brought them home.• They were moderns, they must keep faith with their generation and not look back towards the old one.• He was my husband, and I, wretch that I am, could not keep faith with him.• The military regime has not kept faith with its promises of democratic reform.