Whenever there is a decay of righteousness, O Bharata, and a rise of unrighteousness, then I manifest Myself.

yadā yadā = whenever and wherever; hi = certainly; dharmasya = of religion; glāniḥ = discrepancies; bhavati = become manifested; bhārata = O descendant of Bharata; abhyutthānaṃ = predominance; adharmasya = of irreligion; tadā = at that time; ātmānaṃ = self; sṛjāmi = manifest; ahaṃ = I.;