Genesis 49:3

3 Reuben, you are amy firstborn,
my might, and the bfirstfruits of my strength,
preeminent in dignity and preeminent in power.

Deuteronomy 21:17

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 cthe firstfruits of his strength. dThe right of the firstborn is his.

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