Bhagavatapurana 11.27.41

11.27.41

juhuyān mūla-mantreṇa ṣoḍaśarcāvadānataḥ /
dharmādibhyo yathā-nyāyaṃ mantraiḥ sviṣṭi-kṛtaṃ budhaḥ //

41. He should pour the offerings into the fire with the Moola mantra and portions of the offering with the sixteen verses and according to custom, the learned man ought to pour duly offerings also to Dharma and other dieties, and (then) *svishtakrit* offering to Agni.