lord krishna wud descend on earth to save dharma

Yada Yadah hi Dhramsya, Glanirbhavathi Bharatha, Abhyutthanam Adharmasya,Tadatmanam srijamyah Ahama 4.7 GITA

("Whenever there is decay, of righteousness O! Bharatha,And a rise of unrighteousness, then I manifest Myself!")

Praritranaya Sadhunam, Vinashaya Cha dushkritam,Dharamasansthapanarthaya,Sambhavami Yuge-Yuge." 4.8 (GITA)

("For the protection of the good, for the destruc­tion of the wicked and for the establishment of righteousness, I am born in every age.")