Shatapatha Brahmana 5.5.5.15

5.5.5.15

atho hainayāpi bhiṣajyet | yaṃ nvevaikayarcā bhiṣajyedekena yajuṣaikena sāmnā taṃ nvevāgadaṃ kuryātkimu yaṃ trayeṇa vedena tasmādu hainayāpi bhiṣajyet

And, indeed, one may also heal thereby; for, verily, whomsoever one would heal by a single rik, by a single yagus, by a single sâman, him he would indeed render free from disease; how much more so by the triple Veda! Therefore one may also heal by this (offering).