Bhagavad Gita, Chapter 14, Verse 8

तमस्त्वज्ञानजं विद्धि मोहनं सर्वदेहिनाम् । प्रमादालस्यनिद्राभिस्तन्निबध्नाति भारत

tamastvajñānajaṃ viddhi mohanaṃ sarvadehinām | pramādālasyanidrābhistannibadhnāti bhārata

Translation

But, know thou Tamas to be born of unwisdom, deluding all embodied beings; by heedlessness, indolence and sloth, it binds fast, O Bhārata.

— Alladi Mahadeva Sastri

Word meanings

tamaḥ
inertia
tu
indeed
ajñānajam
from ignorance, born
viddhi
know
mohanam
the causer of delusion
sarvadehinām
(of) all, of embodied
pramādālasyanidrābhiḥ
by heedlessness, and, by indolence, and, by sloth, and
tat
that
nibadhnāti
binds
bhārata
O Bhārata

Śaṅkarācārya's commentary

The third guṇa, Tamas, causes delusion or non-discrimination. It binds the embodied one fast through heedlessness, indolence and sloth.