Anandakanda 1.15.97

1.15.97

gavāṃ kṣīraṃ palaṃ peyaṃ pūrvavatphalamāpnuyāt /
oṃ āṃ haṃsamālini svāhā ayaṃ bhakṣaṇamantraḥ /
<6. hastikarṇīkalpaḥ; hastikarṇīpatrakalpaḥ>
athenduvārasaṃyuktatrayodaśyāṃ samāharet //

One pala of cow's milk is to be drunk [afterwards]; he obtains the fruit as before. / “Oṃ āṃ, O goddess garlanded with swans, svāhā!” This is the consumption mantra.
<6. Hastikarṇīkalpa; Hastikarṇīpatrakalpa>
Then, on the thirteenth day coinciding with Monday, one should gather [it]: