Śatapatha Brāhmaṇa ("of a hundred paths") 5.3.1.11

5.3.1.11

atha śvo bhūte | pālāgalasya gṛhānparetya caturgṛhītamājyaṃ gṛhītvādhvana ājyaṃ juhoti juṣāṇo 'dhvājyasya vetu svāheti praheyo vai pālāgalo 'dhvānaṃ vai prahita eti tasmādadhvana ājyaṃ juhotyetadvā asyaikaṃ ratnaṃ yatpālāgalastasmā evaitena sūyate taṃ svamanapakramiṇaṃ kurute tasya dakṣiṇā pyukṣṇaveṣṭitaṃ dhanuścarmamayā vāṇavanto lohita uṣṇīṣa etadu hi tasya bhavati

And on the following day he goes to the house of the Courier, and having taken ghee in four ladlings, he offers the ghee to the way, with, 'May the way graciously accept of the ghee, hail!' For the courier is to be dispatched, and when dispatched goes on his way: therefore he offers the ghee to the way. And he, the courier, assuredly is one of his (the king's) jewels: it is for him that he is thereby consecrated, and him he makes his own faithful follower. The sacrificial fee for this (jewel) consists in a skin-covered bow, leathern quivers, and a red turban, for that is what belongs to him.