ataeva jarad-gava mare muni-gana
veda-mantre siddha kare tahara jivana
ataeva—therefore; jarad-gava—old cows; mare—killed; muni-gana—sages; veda-mantre—by the power of Vedic hymns; siddha—rejuvenated; kare—makes; tahara—his; jivana—life.
"Therefore the great sages sometimes killed old cows, and by chanting Vedic hymns they again brought them to life for perfection.
Link to this page: https://prabhupadabooks.com/cc/adi/17/161