Sunan Abi Dawud 4872
سنن أبي داود#4872SahihAbu Hurairah reported the Prophet (May peace be upon him) as saying:The worst of the people is a man who is double-faced; he presents one face to some and another to others
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 43:100