Bhagavad Gita Chapter 18 Verse 25
अनुबन्धम्, क्षयम्, हिंसाम् अनवेक्ष्य, च, पौरुषम्,
मोहात्, आरभ्यते, कर्म, यत्, तत्, तामसम्, उच्यते।।25।।
Anubandham’, kshayam’, hinsaam’, anvekshya, ch, paurusham’,
Mohaat’, aarabhyate, karm, yat’, tat’, taamsam’, uchyate ||25||
Translation: (Yat’) which (karm) action (anubandham’) result (kshayam’) loss (hinsaam’) violence (ch) and (paurusham’) capability (anvekshya) without considering (mohat’) only with ignorance (aarabhyate) is commenced (tat’) that action (taamsam’) Tamas (uchyate) is said to be. (25)
Translation: An action which without considering the result, loss, violence and capability, is only commenced with ignorance, that action is said to be Tamas.