Śatapatha Brāhmaṇa ("of a hundred paths") 2.1.2.8

2.1.2.8

mṛgaśīrṣe 'gnī ādadhīta | etadvai prajāpateḥ śiro yanmṛgaśīrṣaṃ śrīrvai śiraḥ śrīrhi vai śirastasmādyo 'rdhasya śreṣṭho bhavatyasāvamuṣyārdhasya śira ityāhuḥ śriyaṃ ha gacati ya evaṃ vidvānmṛgaśīrṣa ādhatte

He may also set up his fires under (the asterism of) Mrigasîrsha. For Mrigasîrsha, indeed, is the head of Pragâpati; and the head (siras) means excellence (srî), for the head does indeed mean excellence: hence they say of him who is the most excellent (sreshtha) of a community, that he is the head of that community. Excellence therefore he attains whosoever, knowing this, sets up his fire under Mrigasîrsha.