jarad-gava hañā yuvā haya āra-vāra
tāte tāra vadha nahe, haya upakāra
jarad-gava—old, invalid cows; hañā—becoming; yuvā—young; haya—become; āra-vāra—again; tāte—in that action; tāra—his; vadha—killing; nahe—is not; haya—there is; upakāra—benefit.
"The killing and rejuvenation of such old and invalid cows was not truly killing but an act of great benefit.
Link to this page: https://prabhupadabooks.com/cc/adi/17/162