Shatapatha Brahmana 9.5.1.22

9.5.1.22

teṣu preteṣu | upasado 'tanvata te tisra eva sāmidhenīranūcya devatā evāyajanna prayājānnānuyājānubhayato yajñasyodasādayanbhūyiṣṭhaṃ hi tatrātvaranta tasmādupasatsu tisra eva sāmidhenīranūcya devatā eva yajati na prayājānnānuyājānubhayato yajñasyotsādayati

When they had gone away, they (the gods) spread out (performed) the Upasads. When they had recited three kindling-verses, and no more, they made offering to the deities, but laid out no fore-offerings and no after-offerings on either side of the sacrifice, for they were in too great haste at that time; whence at the Upasads, when he has recited three kindling-verses, and no more, he makes offering to the deities, but lays out no fore-offerings and no after-offerings on either side of the sacrifice.