Kathakagrihyasutra 50.4

Kāṭhakagṛhyasūtrabhāṣya 50.4

dakṣiṇālobhena ṛtvijaḥ abhyasyanti yajñavidyāṃ, samyaganutiṣṭhanti ca karmāṇi| tena dakṣiṇayā āyuṣmattvaṃ yajñasya|