Leviticus 25:46
And ye shall take them as an inheritance for your children after you, to inherit them for a possession; they shall be your bondmen for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigour.
Cross-references
Leviticus 25:39 forbids treating fellow Israelites as slaves — contrasting with the permanent slavery of foreigners allowed here.
Leviticus 25:43 commands not ruling ruthlessly over brothers — the same principle referenced here as the contrast to foreign slaves.
Exodus 21:21 treats a slave as the owner's money — directly parallel to the permission here to own slaves as inheritable property.
Exodus 1:14 shows Egyptians ruthlessly enslaving Israelites — the very oppression this law prohibits toward brothers, contrasting the permission for foreign slaves.
Isaiah 14:2 envisions Israel ruling over former oppressors as slaves — a reversal that echoes the foreign servitude allowed here.
Job 31:13 asserts Job did not reject his servants' cause — contrasting the assumption of absolute ownership here with a call for just treatment.