Chapter 14 · The Three Qualities · Krishna said
Bhagavad Gita 14.8 — The quality of inertia
तमस्त्वज्ञानजं विद्धि मोहनं सर्वदेहिनाम्। प्रमादालस्यनिद्राभिस्तन्निबध्नाति भारत ॥
tamastvajñānajaṃ viddhi mohanaṃ sarvadehinām | pramādālasyanidrābhistannibadhnāti bhārata ||
Meaning
Tamas is born of ignorance and deludes all beings. It binds through carelessness, laziness and sleep.