Bhagavatapurana 6.9.54

6.9.54

yuṣmabhyaṃ yācito 'śvibhyāṃ dharmajño 'ṅgāni dāsyati /
tatastairāyudhaśreṣṭho viśvakarmavinirmitaḥ /
yena vṛtraśiro hartā mattejaupabṛṃhitaḥ //

54. Entreated by Aswins Dahyang possessed of insight into the Dharma will give the members of his body; then with those parts the best of weapons will be forged by Viswakarma.

55. With that weapon thou imbued with My presence and power wilt cut the head of Vrithra; when he is destroyed thou wilt recover thy energy, missiles, weapons and wealth; may thou be happy! for none can afflict those who are devoted to Me.