Deuteronomy 15:19
All the first born males that come of your herd and of your flock you shall sanctify unto the LORD your God: you shall do no work with the first born of your bullock, nor shear the first born of your sheep.
All the first born males that come of your herd and of your flock you shall sanctify unto the LORD your God: you shall do no work with the first born of your bullock, nor shear the first born of your sheep.