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Krṣṇa,  the Supreme Personality of Godhead
to elevate himself by the purificatory process to the stage of brahminical life. If he doesn't, if he degrades himself further, then he is called  mleccha . Kālayavana belonged to the class of  mleccha  and  yavanas . He was contaminated by sinful activities and could not approach Krṣṇa. The principles from which higher class men are restricted, namely illicit sex indulgence, meat eating, gambling and intoxication, are part and parcel of the lives of the  mlecchas  and  yavanas . Being bound by such sinful activities one cannot make any advancement in God realization. The  Bhagavad-gītā  confirms that only one who is completely freed from all sinful reactions can be engaged in devotional service or Krṣṇa consciousness.
When Krṣṇa entered the cave of the hill, Kālayavana followed, chastising Him with various harsh words. Krṣṇa suddenly disappeared from the demon's sight, but Kālayavana followed and also entered the cave. The first thing he saw was a man lying down asleep within the cave. Kālayavana was very anxious to fight with Krṣṇa, and when he could not see Krṣṇa, but saw instead only a man lying down, he thought that Krṣṇa was sleeping within this cave. Kālayavana was very puffed up and proud of his strength, and he thought Krṣṇa was avoiding the fight. Therefore, he very strongly kicked the sleeping man, thinking him to be Krṣṇa. The sleeping man had been lying down for a very long time. When he was awakened by the kicking of Kālayavana, he immediately opened his eyes and began to look around in all directions. At last he began to see Kālayavana, who was standing nearby. This man was untimely awakened and therefore very angry, and when he looked upon Kālayavana in his angry mood, rays of fire emanated from his eyes, and Kālayavana burned into ashes within a moment.
Thus ends the Bhaktivedanta purport of the Forty-ninth Chapter of Krṣṇa, "Krṣṇa Erects the Dvārakā Fort."