Śatapatha Brāhmaṇa ("of a hundred paths") 3.1.3.25

3.1.3.25

athāṅgulīrnyacati | svāhā yajñam manasa iti dve svāhororantarikṣāditi dve svāhā dyāvāpṛthivībhyāmiti dve svāhā vātādārabha iti muṣṭīkaroti na vai yajñaḥ pratyakṣamivārabhe yathāyaṃ daṇḍo vā vāso vā paro 'kṣaṃ vai devāḥ paro 'kṣaṃ yajñaḥ

He (the sacrificer) then bends his fingers inwards, viz. the two (little fingers), with the text (Vâg. S. IV, 6), 'Hail, from the mind (I take hold of) the sacrifice!'--the two (nameless or ring fingers) with, 'Hail, from the wide ether!'--the two (middle fingers) with, 'Hail, from the sky and earth!'--with, 'Hail, from the wind, I take hold (of the sacrifice)!' he clenches both fists. Not visibly indeed is the sacrifice to be taken hold of, as is either this staff or the garment,--but invisible indeed are the gods, invisible is the sacrifice.