SB 10.36.20
pratiyate tu devarsau
kamsa abhasya kesinam
presayam asa hanyetam
bhavata rama-kesavau
Translation:
After Narada left, King Kamsa summoned Kesi and ordered him, “Go kill Rama and Krsna.”
Purport:
Before having Krsna and Balarama brought to Mathura, Kamsa tried sending one more demon to Vrndavana.