Mantrabrahmana 2.2.13

2.2.13

eṣā eva sā yā prathamā vi-aucchat
sā dhenuṣ abhavat viśva-rūpā /
saṃvatsarasya yā patnī
sā nas astu su-maṅgalī //

This is indeed she who first shone forth; / she became an all-formed milch cow. / She who is the consort of the year, / may she be very auspicious for us!