The Prophet said:
Whoever wishes to advise the one with authority, he should not do
so openly; rather he should take him by the hand and take him into seclusion;
if he accepts from him, then he has achieved his goal, and if not, then he has
fulfilled his obligation.
Reported by Ahmad (3/403) and Ibn Abee ‘Aasim (2/521) with a
saheeh isnaad.
Translation source: Masjid al-Furqan (Stoke on Trent)
https://masjidfurqan.co.uk/