Śatapatha Brāhmaṇa ("of a hundred paths") 1.2.4.15

1.2.4.15

atha tṛṇamantardhāya praharati | nedanena vajreṇa saṃśitena pṛthivīṃ hinasānīti tasmāttṛṇamantardhāya praharati

Thereupon, after putting the grass-bush between, he flings (the wooden sword at it). 'Lest I should injure the earth with this sharp thunderbolt!' thus (he thinks, and) for that reason he flings after putting the grass-bush between.