sing somebody’s praises
From Longman Dictionary of Contemporary Englishsing somebody’s praisessing somebody’s praisesPRAISEto praise someone very much Mrs Edwards was singing your praises today. → singExamples from the Corpussing somebody’s praises• Diane really admires you - she's always singing your praises.• Feminists have long sung the praises of writers such as Germaine Greer and Simone de Beauvoir.• Craig adored Jane and would sing her praises to anyone who would listen.