B.G 17.11

अफलाकाङ्क्षिभिर्यज्ञो विधिदृष्टो य इज्यते। यष्टव्यमेवेति मनः समाधाय स सात्त्विकः ॥११॥

aphalākāṅkṣibhiryajño vidhidṛṣṭo ya ijyate। yaṣṭavyameveti manaḥ samādhāya sa sāttvikaḥ ॥11॥

[अफलाकाङ्क्षिभिः (aphalākāṅkṣibhiḥ) - by those without desire for results; यज्ञः (yajñaḥ) - sacrifice; विधि-दृष्टः (vidhi-dṛṣṭaḥ) - as per scriptural injunctions; यः (yaḥ) - which; इज्यते (ijyate) - is performed; यष्टव्यम् (yaṣṭavyam) - ought to be performed; एव (eva) - certainly; इति (iti) - thus; मनः (manaḥ) - mind; समाधाय (samādhāya) - having fixed; सः (saḥ) - that; सात्त्विकः (sāttvikaḥ) - in the mode of goodness;]

The sacrifice performed by those without desire for results, as per scriptural injunctions, with the mind fixed on the thought that it ought to be performed, is in the mode of goodness.