Maliks Muwatta Book 56, Hadith Number 21.
Section : Squandering Property and Being Two-faced.
Malik related to me from Abu’z-Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, “One of the most evil of people is the two-faced person who shows one face to these people and another face to those people.”