Numbers 19:2 "This is the statute of the law which the LORD has commanded, saying, 'Speak to the sons of Israel that they bring you an unblemished red heifer in which is no defect and on which a yoke has never been placed.

Deuteronomy 21:3 "It shall be that the city which is nearest to the slain man, that is, the elders of that city, shall take a heifer of the herd, which has not been worked and which has not pulled in a yoke;

Deuteronomy 21:4 and the elders of that city shall bring the heifer down to a valley with running water, which has not been plowed or sown, and shall break the heifer's neck there in the valley.

2 Samuel 6:3 They placed the ark of God on a new cart that they might bring it from the house of Abinadab which was on the hill; and Uzzah and Ahio, the sons of Abinadab, were leading the new cart. (NASB ©1995)