Śatapatha Brāhmaṇa ("of a hundred paths") 14.2.2.41

14.2.2.41

atha rauhiṇau juhoti ahaḥ ketunā juṣatāṃ sujyotirjyotiṣā svāhetyasāveva bandhū rātriḥ ketunā juṣatāṃ sujyotirjyotiṣā svāhetyasāveva bandhuḥ

He then offers (the second of) the two Rauhina (cakes) with, 'May the day be pleased with its brightness, the well-lighted with its light, hail!'--the mystic import of this is the same as before;--'may the night be pleased with its brightness, the well-lighted with its light, hail!'--the mystic import of this is the same as before.