Bhagwad Gita
Chapter 17, Verse 10
यातयामं गतरसं पूति पर्युषितं च यत्।उच्छिष्टमपि चामेध्यं भोजनं तामसप्रियम्।।17.10।।
That which is stale, tasteless, putrid, rotten, rejected, and impure is the food liked by the Tamasic.