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अफलाकाङ्क्षिभिर्यज्ञो विधिदृष्टो य इज्यते |
यष्टव्यमेवेति मन समाधाय स सात्त्विक || 11||
Design

17.11
Sacrifice that is performed according to scriptural injunctions without expectation of rewards, with the firm conviction of the mind that it is a matter of duty, is of the nature of goodness.

The nature of
yajña
also corresponds to the three
guṇas
. Shree Krishna begins by explaining the type of sacrifice in the mode of goodness.
Aphala-ākāṅkṣhibhiḥ
means that the sacrifice should be performed without expectation of any reward.
Vidhi driṣhṭaḥ
means that it must be done according to the injunctions of the Vedic scriptures.
Yaṣhṭavyam
evaiti
means that it must be performed only for the sake of worship of the Lord, as required by the scriptures. When
yajña
is performed in this manner, it is classified in the mode of goodness.