Chapter 17 · verse 10 · gita.yoga.org

Bhagavad Gita 17.10

यातयामं गतरसं पूति पर्युषितं च यत्।उच्छिष्टमपि चामेध्यं भोजनं तामसप्रियम्

That which is stale, tasteless, putrid, rotten, rejected, and impure is the food liked by the Tamasic.