Read Deuteronomy 15:19 Using Other Translations
All the firstling males that come of thy herd and of thy flock thou shalt sanctify unto the LORD thy God: thou shalt do no work with the firstling of thy bullock, nor shear the firstling of thy sheep.
"All the firstborn males that are born of your herd and flock you shall dedicate to the LORD your God. You shall do no work with the firstborn of your herd, nor shear the firstborn of your flock.
“You must set aside for the LORD your God all the firstborn males from your flocks and herds. Do not use the firstborn of your herds to work your fields, and do not shear the firstborn of your flocks.