Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 23

Sanskrit:

मदर्पणं निष्फलं वा सात्त्विकं निजकर्म तत् ।राजसं फलसङ्कल्पं हिंसाप्रायादि तामसम् ॥ २३ ॥

ITRANS:

mad-arpaṇaṁ niṣphalaṁ vāsāttvikaṁ nija-karma tatrājasaṁ phala-saṅkalpaṁhiṁsā-prāyādi tāmasam

Translation:

Work performed as an offering to Me, without consideration of the fruit, is considered to be in the mode of goodness. Work performed with a desire to enjoy the results is in the mode of passion. And work impelled by violence and envy is in the mode of ignorance.

Purport:

Ordinary work performed as an offering to God, without desire for the result, is understood to be in the mode of goodness, whereas activities of devotion — such as chanting and hearing the glories of the Lord — are transcendental forms of work beyond the modes of nature.