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Genesis 25:6

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6 and to the sons of the concubines whom Abraham hath, Abraham hath given gifts, and sendeth them away from Isaac his son (in his being yet alive) eastward, unto the east country.

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Deuteronomy 21:17

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17 But the first-born, son of the hated one, he doth acknowledge, to give to him a double portion of all that is found with him, for he [is] the beginning of his strength; to him [is] the right of the first-born.