Deuteronomy 15:18

Let it not seem hard to you that you have to send him away free; for he has been working for you for six years, which is twice the regular time for a servant: and the blessing of the Lord your God will be on you in everything you do.

Isaiah 16:14

But now the Lord has said, In three years, the years of a servant working for payment, the glory of Moab, all that great people, will be turned to shame, and the rest of Moab will be very small and without honour.

Isaiah 21:16

For so has the Lord said to me, In a year, by the years of a servant working for payment, all the glory of Kedar will come to an end:

Luke 17:7-8

But which of you, having a servant who is ploughing or keeping sheep, will say to him, when he comes in from the field, Come now and be seated and have a meal,

Treasury of Scripture Knowledge

Summary

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.

Shall not

Bible References

Shall not

Deuteronomy 15:10
But it is right for you to give to him, without grief of heart: for because of this, the blessing of the Lord your God will be on all your work and on everything to which you put your hand.

A double

Isaiah 16:14
But now the Lord has said, In three years, the years of a servant working for payment, the glory of Moab, all that great people, will be turned to shame, and the rest of Moab will be very small and without honour.
Isaiah 21:16
For so has the Lord said to me, In a year, by the years of a servant working for payment, all the glory of Kedar will come to an end:
Luke 17:7
But which of you, having a servant who is ploughing or keeping sheep, will say to him, when he comes in from the field, Come now and be seated and have a meal,

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain