SB 1.7.29

sūta uvāca
śrutvā bhagavatā proktaṁ
 phālgunaḥ para-vīra-hā
spṛṣṭvāpas taṁ parikramya
 brāhmaṁ brāhmāstraṁ sandadhe
Synonyms: 
sūtaḥ — Sūta Gosvāmī; uvāca — said; śrutvā — after hearing; bhagavatā — by the Personality of Godhead; proktam — what was said; phālgunaḥ — another name of Śrī Arjuna; para-vīra- — the killer of the opposing warrior; spṛṣṭvā — after touching; āpaḥ — water; tam — Him; parikramya — circumambulating; brāhmam — the Supreme Lord; brāhma-astram — the supreme weapon; sandadhe — acted on.
Translation: 
Śrī Sūta Gosvāmī said: Hearing this from the Personality of Godhead, Arjuna touched water for purification, and after circumambulating Lord Śrī Kṛṣṇa, he cast his brahmāstra weapon to counteract the other one.