Text 61] Kṛṣṇa, the Supreme Personality of Godhead
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and Lord Śiva. [For instance, Kṛṣṇa arranged the Battle of Kurukṣetra to kill many demons for the relief of the entire world.]
TEXT 61
कलौ जनिष्यमाणानां दुःखशोकतमोनुदम् । अनुग्रहाय भक्तानां सुपुष्पं व्यतनोद् यशः ॥६१॥
kalau janiṣyamāṇānām duḥkha-śoka-tamo-nudam anugrahāya bhaktānām supuṇyam vyatanod yaśaḥ
kalau —in this age of Kali;  janiṣyamāṇānām —of the conditioned souls who will take birth in the future;  duḥkha-śoka-tamaḥ-nudam —to minimize their unlimited unhappiness and lamentation, which are caused by ignorance;  anugrahāya —just to show mercy;  bhaktānām —to the devotees;  su-puṇyam —very pious, transcendental activities;  vyatanot —expanded;  yaśaḥ —His glories or reputation.
TRANSLATION
To show causeless mercy to the devotees who would take birth in the future in this age of Kali, the Supreme Personality of Godhead, Kṛṣṇa, acted in such a way that simply by remembering Him one will be freed from all the lamentation and unhappiness of material existence. [In other words, He acted so that all future devotees, by accepting the instructions of Kṛṣṇa consciousness stated in Bhagavad-gītā, could be relieved from the pangs of material existence.]
PURPORT
The Lord's activities of saving the devotees and killing the demons ( paritrāṇāya sādhūnām vināśāya ca duṣkṛtām ) take place side by side. Kṛṣṇa actually appears for the deliverance of the  sādhus , or  bhaktas , but by killing the demons He shows them mercy also, for anyone killed by Kṛṣṇa is liberated. Whether the Lord kills or gives protection, He is kind to both the demons and the devotees.