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.

Read Deuteronomy 15:18 Using Other Translations

It shall not seem hard unto thee, when thou sendest him away free from thee; for he hath been worth a double hired servant to thee, in serving thee six years: and the LORD thy God shall bless thee in all that thou doest.
It shall not seem hard to you when you let him go free from you, for at half the cost of a hired servant he has served you six years. So the LORD your God will bless you in all that you do.
“You must not consider it a hardship when you release your servants. Remember that for six years they have given you services worth double the wages of hired workers, and the LORD your God will bless you in all you do.