Deuteronomy 15:18-20 New Revised Standard Version Catholic Edition (NRSVCE)
18 Do not consider it a hardship when you send them out from you free persons, because for six years they have given you services worth the wages of hired laborers; and the Lord your God will bless you in all that you do.
The Firstborn of Livestock
19 Every firstling male born of your herd and flock you shall consecrate to the Lord your God; you shall not do work with your firstling ox nor shear the firstling of your flock. 20 You shall eat it, you together with your household, in the presence of the Lord your God year by year at the place that the Lord will choose.
Deuteronomy 15:18-20 New International Version (NIV)
18 Do not consider it a hardship to set your servant free, because their service to you these six years has been worth twice as much as that of a hired hand. And the Lord your God will bless you in everything you do.
The Firstborn Animals
19 Set apart for the Lord your God every firstborn male of your herds and flocks. Do not put the firstborn of your cows to work, and do not shear the firstborn of your sheep. 20 Each year you and your family are to eat them in the presence of the Lord your God at the place he will choose.