यदा ह्यधर्मेण तमोधियो नृपा जीवन्ति तत्रैष हि सत्त्वतः किल ।
धत्ते भगं सत्यमृतं दयां यशो भवाय रूपाणि दधद्युगे युगे ॥२५॥

yadā hy adharmeṇa tamo-dhiyo nṛpā
jīvanti tatraiṣa hi sattvataḥ kila
dhatte bhagaṁ satyam ṛtaṁ dayāṁ yaśo
bhavāya rūpāṇi dadhad yuge yuge


Text

When kings whose minds are affected by ignorance live by irreligion, then Kṛṣṇa, accepting forms for the welfare of the world in Vraja, Mathurā and Dvārakā, in every day of Brahmā, displays his six powers, truth, pleasing words, mercy and good qualities endowed with pure sattva.

Purport

For those asking about the time, place and persons for the avataras’ appearances, they first speak of the time. Kings (nrpah) refers to person like Kamsa. When these kings appear, the Lord assumes his six powers (bhagam), truth (satyam), pleasant words (rtam), mercy and good qualities, endowed with the highest sattva (sattvatah). He accepts beautiful forms in Vraja, Mathura and Dvaraka in every day of Brahma (yuge yuge), or in every Dvapara-yuga of the twenty-eighth cycle in Vaivasvata-manvantara in each day of Brahma.