Yuga-Vibhāga and Kāla-Pramāṇa
Measures of Time and the Four Yugas
संभृताच्च तदा मन्त्रा ऋषिभिर्ब्रह्मणः सुतैः / यज्ञाः प्रवर्त्तिताश्चैव तदा ह्येव तु दैवतैः
saṃbhṛtācca tadā mantrā ṛṣibhirbrahmaṇaḥ sutaiḥ / yajñāḥ pravarttitāścaiva tadā hyeva tu daivataiḥ
Then the sages, sons of Brahmā, gathered the mantras; and at that very time the gods set the yajñas, the sacred sacrifices, into motion.