Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 11
Sanskrit:
यदा आशिष आशास्य मां भजेत स्वकर्मभि: ।तं रज:प्रकृतिं विद्यात् हिंसामाशास्य तामसम् ॥ ११ ॥
ITRANS:
yadā āśiṣa āśāsyamāṁ bhajeta sva-karmabhiḥtaṁ rajaḥ-prakṛtiṁ vidyāthiṁsām āśāsya tāmasam
Translation:
When a person worships Me by his prescribed duties with the hope of gaining material benefit, his nature should be understood to be in passion, and one who worships Me with the desire to commit violence against others is in ignorance.