Śatapatha Brāhmaṇa ("of a hundred paths") 3.3.4.22

3.3.4.22

taddhaike | āhavanīyādulmukamāharantyayamagnirayaṃ somastābhyāṃ saha sadbhyāṃ niṣkreṣyāmaha iti vadantastadu tathā na kuryādyatra vā etau kva ca tatsahaiva

Now, some take a firebrand from the Âhavanîya, saying, 'Here is Agni, and here is Soma: with these two thus being together we will redeem ourselves.' But let him not do this; for wheresoever these two are, there they are indeed together.