Śatapatha Brāhmaṇa ("of a hundred paths") 14.2.2.14

14.2.2.14

ānīte japati svāhā gharmaḥ pitra iti yajñasya śīrṣacinnasya [raso vyakṣaratsa] pitṝ!nagacattrayā vai pitarastānevaitatprīṇātyavaraṃ svāhākāraṃ karoti parāṃ devatāmasāveva bandhuḥ

When it has been poured in, he mutters, 'Hail, the Gharma to the Fathers!' When the sacrifice had its head cut off, its life-sap flowed away, and went to the Fathers--the Fathers being three in number: it is these he thus pleases. The call of 'hail!' he places first, and the deity last: the significance of this is the same as before.