Brihat Samhita
षण्मासौत्तरवृद्ध्या पर्वेशाः सप्त देवताः क्रमशः । ब्रह्मशशिइन्द्रकुबेरा वरुणाग्नियमाश्च विज्ञेयाः ॥ ५-१९ ॥
Commencing from the time of creation, Brahmā is the lord over the new and full moon periods of the first six months; the Moon is the lord over those of the second six months; Indra over those of the third six months; Kubera over those of the fourth six months; Varuṇa over those of the fifth six months; Agni over those of the sixth six months and Yama over those of the seventh six months; and so on the cycle being repeated over and over again.
english translation
SaNmAsauttaravRddhyA parvezAH sapta devatAH kramazaH । brahmazaziindrakuberA varuNAgniyamAzca vijJeyAH ॥ 5-19 ॥
hk transliteration by Sanscript