Exodus 12:44

but every man’s slave purchased with money, after you have circumcised him, then he may eat of it.

Genesis 17:12-13

And every male among you who is eight days old shall be circumcised throughout your generations, a servant who is born in the house or who is bought with money from any foreigner, who is not of your descendants.

Genesis 17:23

Then Abraham took Ishmael his son, and all the servants who were born in his house and all who were bought with his money, every male among the men of Abraham’s household, and circumcised the flesh of their foreskin in the very same day, as God had said to him.

Treasury of Scripture Knowledge

Summary

Exodus 12:44

But every man's servant that is bought for money, when thou hast circumcised him, then shall he eat thereof.

Circumcised

Genesis 17:12

General references

Leviticus 25:44

Bible References

Circumcised

General references

As for your male and female slaves whom you may have—you may acquire male and female slaves from the pagan nations that are around you.