(Avathar yet to come)

paritranaya saadunaam vinashayasa dushkrudham
dharma samsthaba narthaya sambavami yuge yuge

(meaning)

Whenever evil over-takes the good and the world is sinking with sins at that time I will come to
annihilate the evil and establish righteousness.

 quote ;by Lord Sri Krishna
 from Bhagavat Geeta :-