Bhagavad Gita 18.39

यदग्रे चानुबन्धे च सुखं मोहनमात्मनः।निद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम् ॥१८.३९॥

yadagre cānubandhe ca sukhaṃ mohanamātmanaḥnidrālasyapramādotthaṃ tattāmasamudāhṛtam

That happiness which at first, as well as in the end, deludes the self, and which arises from sleep, indolence, and heedlessness—that is declared to be Tamasic.

गीता