CC Adi 17.158

tomāra vedete āche go-vadhera vāṇī
ataeva go-vadha kare baḍa baḍa muni

tomāra vedete—in Your Vedic literatures; āche—there is; go-vadhera—for cow-killing; vāṇī—injunction; ataeva—therefore; go-vadha—cow-killing; kare—does; baḍa baḍa—very, very great; muni—sages.

As a learned scholar, the Kazi challenged Caitanya Mahāprabhu, “In Your Vedic scriptures there is an injunction for killing a cow. On the strength of this injunction, great sages performed sacrifices involving cow-killing.”