Text 18]
The Sacrifice Performed by Dakṣa
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if one chants or even remembers the holy name of the Supreme Personality of Godhead Viṣṇu, he immediately becomes purified. The  yajña  arena was desecrated by the presence of Lord Śiva's followers, headed by Vīrabhadra, and therefore the entire arena had to be sanctified. Although Lord Śiva was present and he is all-auspicious, it was still necessary to sanctify the place because his followers had broken into the arena and committed so many obnoxious acts. That sanctification was possible only by chanting the holy name of Viṣṇu, Trikapālam, which can sanctify the three worlds. In other words, it is admitted herein that the followers of Lord Śiva are generally unclean. They are not even very hygienic; they do not take baths regularly, they wear long hair, and they smoke  gāñjā . Persons of such irregular habits are counted amongst the ghosts. Since they were present in the sacrificial arena, the atmosphere became polluted, and it had to be sanctified by offering  trikapāla  oblations which indicated the invocation of Viṣṇu's favor.
TEXT 18
अध्वर्युणाऽऽत्तहविषा यजमानो विशम्पते । धिया विशुद्धया दध्यौ तथा प्रादुरभूद्धरिः ॥१८॥
adhvaryuṇātta-haviṣā   yajamāno viśām-pate   dhiyā viśuddhayā dadhyau   tathā prādur abhūdd hariḥ
adhvaryuṇā —with the  Yajur-veda ;  ātta —taking;  haviṣā —with clarified butter;  yajamānaḥ —King Dakṣa;  viśām-pate —O Vidura;  dhiyā —in meditation;  viśuddhayā —sanctified;  dadhyau —offered;  tathā —immediately;  prāduḥ —manifest;  abhūt —became;  hariḥ —Hari, the Lord.
TRANSLATION
The great sage Maitreya said to Vidura: My dear Vidura, as soon as King Dakṣa offered the clarified butter with  Yajur-veda  mantras in sanctified meditation, Lord Viṣṇu appeared there in His original form as  Nārāyaṇa .
PURPORT
Lord Viṣṇu is all-pervading. Any devotee who, in sanctified meditation, following the regulative principles, chants the required  mantras  in service and in a devotional mood can see Viṣṇu. It is said in the  Brahma-saṁhitā  that a devotee whose eyes are anointed with the ointment of love of Godhead can see the Supreme Personality of Godhead always within his heart. Lord Śyāmasundara is so kind to His devotee.