Śatapatha Brāhmaṇa ("of a hundred paths") 13.8.1.3

13.8.1.3

ayuṅgeṣu samvatsareṣu kuryāt ayuṅgaṃ hi pitṝṇāmekanakṣatra ekanakṣatraṃ hi pitṝṇāmamāvāsyāyāmamāvāsyā vā ekanakṣatrameko hi yadvetāṃ rātriṃ sarvāṇi bhūtāni samvasanti teno taṃ kāmamāpnoti yaḥ sarveṣu nakṣatreṣu

Let him make it in uneven years, since the uneven belongs to the Fathers; and under a single Nakshatra, since the single Nakshatra belongs to the Fathers; and at new-moon, since the new-moon is a single Nakshatra;--for he (the Sacrificer) is a single (person); and in that all the beings dwell together during that night, thereby he obtains that object of desire which is (contained) in all Nakshatras.