Śrīmad-Bhāgavatam · Texts 9.6.15-16
स सन्नद्धो धनुर्दिव्यमादाय विशिखाञ्छितान् ।
स्तूयमानस्तमारुह्य युयुत्सु: ककुदि स्थित: ॥ १५ ॥
तेजसाप्यायितो विष्णो: पुरुषस्य महात्मन: ।
प्रतीच्यां दिशि दैत्यानां न्यरुणत् त्रिदशै: पुरम् ॥ १६ ॥
sa sannaddho dhanur divyam
ādāya viśikhāñ chitān
stūyamānas tam āruhya
yuyutsuḥ kakudi sthitaḥ
tejasāpyāyito viṣṇoḥ
puruṣasya mahātmanaḥ
pratīcyāṁ diśi daityānāṁ
nyaruṇat tridaśaiḥ puram
Well protected by armor and desiring to fight, Purañjaya took up a transcendental bow and very sharp arrows, and, while being highly praised by the demigods, he got up on the back of the bull [Indra] and sat on its hump. Thus he is known as Kakutstha. Being empowered by Lord Viṣṇu, who is the Supersoul and the Supreme Person, Purañjaya sat on the great bull and is therefore known as Indravāha. Surrounded by the demigods, he attacked the residence of the demons in the west.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.