Bhagavatapurana 8.11.35

8.11.35

tapaḥsāramayaṃ tvāṣṭraṃ vṛtro yena vipāṭitaḥ /
anye cāpi balopetāḥ sarvāstrairakṣatatvacaḥ //

35. That *Vajra* by which *Vritra* who was the essence of the mighty Tapas of Twashta was split, as well as many others of formidable strength even the skin of whose bodies was not at all injured by all the other weapons;