Leviticus 25:45
Moreover of the children of the strangers that do sojourn among you, of them shall ye buy, and of their families that are with you, which they begat in your land: and they shall be your possession.
Cross-references
Exodus 21:2
Contrast
Exodus 21:2 limits Hebrew slavery to six years — contrasting with the permanent foreign slavery permitted here.
Exodus 21:21
Parallel
Exodus 21:21 treats the slave as property — parallel to the permanent ownership of foreign slaves permitted here.
Isaiah 56:3–6
Contrast
Isaiah 56:3-6 promises inclusion for foreigners who join the Lord — contrasting with the permission here to buy them as property.