Aitareyabrahmana 3.1.p14

3.1.p14

iii. 8 (xi. 8). He should meditate on the deity for whom the oblation is taken when about to say the _vaṣaṭ_; verily thus openly he delights the deities; before all eyes he sacrifices to the deity. The _vaṣaṭ_ call is a thunderbolt; it shines when hurled if not appeased. Of it not every man as it were knows the appeasing nor the support. From it even now there is often as it were death. The appeasing of it, the support is 'Speech'.