Some people said to Ibn `Umar, "When we enter upon our ruler(s) we say in their praise what is contrary to what we say when we leave them." Ibn `Umar said, "We used to consider this as hypocrisy."
Sahih al-Bukhari Book 93, Hadith 41
← Previous Hadith Marwan bin Al-Hakam and Al-Miswar bin Makhrama told him that when the Muslims were permitted to set free the captives of Hawazin, Allah's Messenger (ﷺ) said, "I do not know who amongst you has agreed (to it) and who has not. Go back so that your 'Urafa' may submit your decision to us." So the people returned and their 'Urafa' talked to them and then came back to Allah's Messenger (ﷺ) and told him that the people had given their consent happily and permitted (their captives to be freed).

Sahih al-Bukhari Book 93, Hadith 40 Next Hadith → Allah's Messenger (ﷺ)s said, "The worst of all mankind is the double-faced one, who comes to some people with one face and to others, with another face."

Sahih al-Bukhari Book 93, Hadith 42