CHĀNDOGYA UPANISHAD · 2.24.1

ब्रह्मवादिनो वदन्ति ।
यद् वसूनां प्रातःसवनम् ।
रुद्राणां माध्यंदिनं सवनम् ।
आदित्यानां च विश्वेषां च देवानां तृतीयसवनम् ॥

brahmavādino vadanti ।
yad vasūnāṃ prātaḥsavanam ।
rudrāṇāṃ mādhyaṃdinaṃ savanam ।
ādityānāṃ ca viśveṣāṃ ca devānāṃ tṛtīyasavanam ॥

The teachers of Brahman (Veda) declare, as the Prâtah-savana (morning-oblation) belongs to the Vasus, the Mâdhyandina-savana (noon-libation) to the Rudras, the third Savana (evening-libation) to the Âdityas and the Visve Devas,

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)