Atharvaveda 12.3.9

12.3.9

pratī́cī diśā́m iyám íd váraṃ yásyāṃ sómo adhipā́ mr̥ḍitā́ ca |
tásyāṃ śrayethāṃ sukŕ̥taḥ sacethām ádhā pakvā́n mithunā sáṃ bhavāthaḥ ||9||

This western of the quarters verily is a thing to be preferred, in which Soma is over-ruler and favorer; to it resort (çri) ye (du.); attach yourselves to the well-doers; then, O paired ones, shall ye come into being from what is cooked.