yada yada hi dharmasya ,Murali Manohar Mohan Murari | mahabharat songs.
krishna life song is murali mohan murari


yada yada hi dharmasya
glanir bhavati bharata
abhyutthanam dharmasya
tadatmanam srjamy aham
paritranaya sadhunam
vinasaya ca duskrtam
dharma-samsthapanarthaya
sambhavami yuge yuge.

translation in english
Whenever and wherever there is a decline in religious practice, O descendant of Bharata, and a predominant rise of irreligion--at that time I descend Myself. In order to deliver the pious and to annihilate the miscreants, as well as to reestablish the principles of religion, I advent Myself millennium after millennium.