Deuteronomy 21:3

And He said, “What have you done? The voice of your brother’s blood is crying out to Me from the ground.

“This is the statute of the law which Yahweh has commanded, saying, ‘Speak to the sons of Israel that they take to you a red heifer without blemish, in which is no defect and on which a yoke has never been placed.

“So innocent blood will not be shed in the midst of your land which Yahweh your God gives you as an inheritance, and bloodguiltiness be on you.

“So now, take and make a new cart and two milch cows on which there has never been a yoke; and hitch the cows to the cart and take their calves home, away from them.