64
Śrīmad-Bhāgavatam
[Canto 6, Ch. 8]
Personality of Godhead Kṛṣṇa Himself. After offering prayers to the Lord's personal expansions known as the  svāmśa  and  śaktyāveśa-avatāras , one should pray to the weapons of Lord Nārāyaṇa, such as the Sudarśana,  gadā ,  śaṅkha ,  khaḍga  and bow.
After explaining this process, Śukadeva Gosvāmī told Mahārāja Parikṣit how Viśvarūpa, the brother of Vṛtrāsura, described the glories of the Nārāyaṇa-kavaca to Indra.
TEXTS 1-2
श्रीराजोवाच
यया गुप्तः सहस्राक्षः सवाहान् रिपुसैनिकान् । 
    क्रीडन्निव विनिर्जित्य त्रिलोक्या बुभुजे श्रियम् ॥१॥ 
    भगवन्तन्ममाख्याहि वर्म नारायणात्मकम् । 
    यथाततायिनः शत्रून् येन गुप्तोऽजयन्मृधे ॥ २ ॥
śrī-rājovāca 
    yayā guptaḥ sahasrākṣaḥ 
    savāhān ripu-sainikān 
    krīḍann iva vinirjitya 
    tri-lokyā bubhuje śriyam
bhagavaṁs tan mamākhyāhi 
    varma nārāyaṇātmakam 
    yathātatāyinaḥ śatrūn 
    yena gupto 'jayan mṛdhe
śrī-rājā uvāca—King Parikṣit said; yayā—by which (the spiritual armor); guptaḥ—protected; sahasra-akṣaḥ—the thousand-eyed King Indra; sa-vāhān—with their carriers; ripu-sainikān—the soldiers and commanders of the enemies; krīḍan iva—just like playing; vinirjitya—conquering; tri-lokyāḥ—of the three worlds (the higher, middle and lower planetary systems); bubhuje—enjoyed; śriyam—the opulence; bhagavan—O great sage; tat—that; mama—unto me; ākhyāhi—please explain; varma—defensive armor made of a mantra; nārāyaṇa-āt-