Genesis 25:6

6But to the sons of his concubines Abraham gave gifts, and while he was still living he asent them away from his son Isaac, eastward bto the east country.

Deuteronomy 21:15-17

Inheritance Rights of the Firstborn

15If a man has two wives, cthe one loved and the other unloved, and both the loved and the unloved have borne him children, and if the firstborn son belongs to the unloved,
Or hated; also verses 16, 17
16then on the day when ehe assigns his possessions as an inheritance to his sons, he may not treat the son of the loved as the firstborn in preference to the son of the unloved, who is the firstborn, 17but he shall acknowledge the firstborn, the son of the unloved, by giving him a double portion of all that he has, for he is fthe firstfruits of his strength. gThe right of the firstborn is his.

2 Chronicles 11:23

23And he dealt wisely and distributed some of his sons through all the districts of Judah and Benjamin, in all the fortified cities, and he gave them abundant provisions and procured wives for them.
Hebrew  and sought a multitude of wives


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