Hiranyakeshigrihyasutra 1.3.11.7

1.3.11.7

devasya tvā \ iti vaiṇavaṃ daṇḍaṃ pratigṛhya \ indrasya vajrosyaśvinau mā pātam \ iti trirūrdhvamunmārṣṭi \7\

With (the formula), 'On the impulse of the god,' &c., he takes a staff of reed (which somebody hands him), and with (the formula), 'Thou art the thunderbolt of Indra. O Asvins, protect me!'—he thrice wipes it off, upwards from below.