Deuteronomy 21:3
Then the elders of the city nearest to the corpse must take from the herd a heifer that has not been worked -- that has never pulled with the yoke --
Numbers 19:2
"This is the ordinance of the law which the Lord has commanded: 'Instruct the Israelites to bring you a red heifer without blemish, which has no defect and has never carried a yoke.
Jeremiah 31:18
I have indeed heard the people of Israel say mournfully, 'We were like a calf untrained to the yoke. You disciplined us and we learned from it. Let us come back to you and we will do so, for you are the Lord our God.
Matthew 11:28-30
Come to me, all you who are weary and burdened, and I will give you rest.
Philippians 2:8
He humbled himself, by becoming obedient to the point of death -- even death on a cross!