To exhibit His personal way of austerity and penance, He appeared in twin forms as Nārāyaṇa and Nara in the womb of Mūrti, the wife of Dharma and the daughter of Dakṣa. Celestial beauties, the companions of Cupid, went to try to break His vows, but they were unsuccessful, for they saw that many beauties like them were emanating from Him, the Personality of Godhead.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
धर्मस्य दक्षदुहितर्यजनिष्ट मूर्त्यां नारायणो नर इति स्वतपःप्रभावः । दृष्ट्वाऽऽत्मनो भगवतो नियमावलोपं देव्यस्त्वनङ्गपृतना घटितुं न शेकुः
dharmasya dakṣaduhitaryajaniṣṭa mūrtyāṃ nārāyaṇo nara iti svatapaḥprabhāvaḥ | dṛṣṭvā''tmano bhagavato niyamāvalopaṃ devyastvanaṅgapṛtanā ghaṭituṃ na śekuḥ
SB 2.7.6