Shatapatha Brahmana 8.5.1.11

8.5.1.11

athottarataḥ | catuścatvāriṃśa stomo varco draviṇamiti catuścatvāriṃśadakṣarā vai triṣṭuptraiṣṭubho vajraḥ sa etena catuścatvāriṃśena vajreṇaitayā triṣṭubhottarataḥ pāpmānamapāhata tathaivaitadyajamāna etena catuścatvāriṃśena vajreṇaitayā triṣṭubhottarataḥ pāpmānamapahate

Then on the left (north) side, with, 'The forty-four-fold Stoma, lustre, wealth!' The Trishtubh consists of forty-four syllables, and the thunderbolt is of Trishtubh nature: with that forty-four-fold thunderbolt, with that Trishtubh, he (Pragâpati) drove away evil in the north; and in like manner does the Sacrificer, with that thunderbolt, with that Trishtubh, now drive away evil in the north.