Kauṣītaki Upaniṣad 2.3.2

2.3.2

yad ekadhanam abhidhyāyāt paurṇamāsyāṃ vāmāvāsyāṃ vā śuddhapakṣe vā puṇye nakṣatre 'gnim upasamādhāya parisamūhya paristīrya paryukṣya [utpūya] dakṣiṇaṃ jānv ācya sruveṇa [vā camasena vā kaṃsena vaitā] ājyāhutīr juhoti /

In case one should covet a special prize—either on the night of a full moon or on the night of a new moon, or during the bright half of the moon under an auspicious constellation—at one of these points of time, having built up a fire, having swept around, having sprinkled around, having purified, having bent the right knee, with a spoon (sruva) or with a wooden bowl (camasa) or with a metal cup (kaṁsa), he offers these oblations of melted butter:—