Verse
अफलाङ्क्षिभिर्यज्ञो विधिदृष्टो य इज्यते ।यष्टव्यमेवेति मनः समाधाय स सात्त्विकः ॥
The sacrifice which is offered by men without desire for the personal fruit, which is executed according to the right principle, and with a mind concentrated on the idea of the thing to be done as a sacrifice, that is sattwic.
Gītā 17·11