SB 6.12.3

kha āpatat tad vicalad graholkavan
 nirīkṣya duṣprekṣyam ajāta-viklavaḥ
vajreṇa vajrī śata-parvaṇācchinad
 bhujaṁ ca tasyoraga-rāja-bhogam
Synonyms: 
khe — in the sky; āpatat — flying toward him; tat — that trident; vicalat — rotating; graha-ulka-vat — like a falling star; nirīkṣya — observing; duṣprekṣyam — unbearable to see; ajāta-viklavaḥ — not afraid; vajreṇa — with the thunderbolt; vajrī — Indra, the holder of the thunderbolt; śata-parvaṇā — possessing one hundred joints; ācchinat — cut; bhujam — the arm; ca — and; tasya — of him (Vṛtrāsura); uraga-rāja — of the great serpent Vāsuki; bhogam — like the body.
Translation: 
Flying in the sky, Vṛtrāsura’s trident resembled a brilliant meteor. Although the blazing weapon was difficult to look upon, King Indra, unafraid, cut it to pieces with his thunderbolt. Simultaneously, he cut off one of Vṛtrāsura’s arms, which was as thick as the body of Vāsuki, the King of the serpents.