SB 10.50.45
tam drstvacintayat krsnah
sankarsana sahayavan
aho yadunam vrjinam
praptam hy ubhayato mahat
Translation:
When Lord Krsna and Lord Sankarsana saw Kalayavana, Krsna thought about the situation and said, “Ah, a great danger now threatens the Yadus from two sides.
Purport:
We may note here that although Sri Krsna had defeated Jarasandha seventeen times against tremendous odds, He did not immediately annihilate the army of Kalayavana, thus keeping intact the benediction granted to Gargya by Lord Siva, as explained in the previous purport.