Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.5.1

4.2.5.1

grahāngṛhītvā | upaniṣkramya vipruṣāṃ homaṃ juhoti tadyadvipruṣāṃ homaṃ juhoti yā evāsyātra vipruṣa skandanti tā evaitadāhavanīye svagākarotyāhavanīyo hyāhutīnām pratiṣṭhā tasmādvipruṣāṃ homaṃ juhoti

Having drawn the cups of Soma, and gone out (of the cart-shed to the high altar), he offers the oblation of drops. The reason why he offers the oblation of drops is this. Whatever drops of that (Soma) are spilt here, to them he now wishes a safe journey to the Âhavanîya, for the Âhavanîya is the resting-place of offerings: this is why he offers the oblation of drops.