Muḥammad b. Zayd b. ʿUmar reports from his father:
Some people said to Ibn ʿUmar, “We enter upon our rulers, and we say to them something different to what we say when we leave their company.” He said, “We used to regard this as [a type of] nifāq (hypocrisy).”
Al-Bukhārī, Ṣaḥīḥ Al-Bukhārī no. 7178, and others.