Text 47] King Purūravā Enchanted by Urvaśī
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one can get a son or disciple through the fire of sacrifice ( yajña ). Thus when Mahārāja Purūravā generated the fire by rubbing the  araṇis , the fire became his son. Either by semen, by initiation or by  yajña  one may get a son. The Vedic  mantra omkāra , or  praṇava , consisting of the letters  a-u-m , can call each of these three methods into existence. Therefore the words  nirmanthanāj jātaḥ  indicate that by the rubbing of the  araṇis  a son was born.
TEXT 47
तेनायजत यज्ञेशं भगवन्तमधोक्षजम् । उर्वशीलोकमन्विच्छन् सर्वदेवमयं हरिम् ॥४७॥
tenāyajata yajñēśaṁ bhagavantam adhokṣajam urvaśī-lokam anvicchan sarva-devamayaṁ harim
tena —by generating such a fire;  ayajata —he worshiped;  yajña-īśam —the master or enjoyer of the  yajña ;  bhagavantam —the Supreme Personality of Godhead;  adhokṣajam —beyond the perception of the senses;  urvaśī-lokam —to the planet where Urvaśī was staying;  anvicchan —although desiring to go;  sarva-deva-mayam —the reservoir of all demigods;  harim —the Supreme Personality of Godhead.
TRANSLATION
By means of that fire, Purūravā, who desired to go to the planet where Urvaśī resided, performed a sacrifice, by which he satisfied the Supreme Personality of Godhead, Hari, the enjoyer of the results of sacrifice. Thus he worshiped the Lord, who is beyond the perception of the senses and is the reservoir of all the demigods.
PURPORT
As stated in  Bhagavad-gītā ,  bhoktāraṁ yajña-tapasāṁ sarva-loka-mahēśvaram : any  loka , or planet, to which one wants to go is the property of the Supreme Personality of Godhead, the enjoyer of the performance of sacrifice. The purpose of  yajña  is to satisfy the Supreme