Matsya Purana 58.32

58.32

juhuyādvāruṇairmantrairājyaṃ ca samidhastathā.
ṛtvigbhiścātha hotavyaṃ vāruṇaireva sarvataḥ.. 58.31 ..

Sacrificial fuel and clarified butter should be offered to the Fire, after reciting the hymns of Varuṇa, and the sacrificing priests should also be made to do the same all round.—31.