Deuteronomy 21:3
And the elders of the city that is nearest to the slain man shall take a heifer that has never been worked and that has not pulled in a yoke.
Numbers 19:2
"This is the statute of the law that the LORD has commanded: Tell the people of Israel to bring you a red heifer without defect, in which there is no blemish, and on which a yoke has never come.
Jeremiah 31:18
I have heard Ephraim grieving, 'You have disciplined me, and I was disciplined, like an untrained calf; bring me back that I may be restored, for you are the LORD my God.
Matthew 11:28-30
Come to me, all who labor and are heavy laden, and I will give you rest.
Philippians 2:8
And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross.