Manasara 7.85

7.85

śeṣamāryavatproktaṃ dhyātvā devaṃ vivasvatam
śyāmavarṇaṃ tu mitraṃ syāccheṣaṃ pūrvavadācaret

the rest declared like Ārya, meditating upon the god Vivasvat; / Mitra should be dark-coloured, the rest should be performed as before;