Genesis 17:27 NASB
27 All the men of his household, who were born in the house or bought with money from a foreigner, were circumcised with him.
What does the above text mean by bought with money from a foreigner?
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Technically, Gen 17 is what is known as the "Covenant" provisions. The Abrahamic Covenant is stated in two places, Gen 15 & 17, 13 years apart (and repeated in Gen 18:9-15, 22:15-18 without using the word “covenant” nor formal sacrifices) and consisted of the following:
This ceremony of cutting sacrificed animals in half is a direct allusion of the word “berith” (= “covenant”), meaning, “to cut”. That this covenant was a covenant of grace is confirmed by Gen 15:6, “Abram believed the LORD and he credited it to him as righteousness”. (See also Rom 4:3, Gal 3:6, James 2:23.)
Gen 17, 18:9-15
Thus, the instruction in Gen 17:27 is to bring all of Abraham's household under provisions of the Abrahamic Covenant, including people born in the household and those slaves purchased from others.
For some further information about this see, Deuteronomy 23:3 Why was Ruth's descendants allowed in the Temple