Rebekah may not be rebuked for her connivance into deceiving Jacob's father, Isaac for giving Jacob the blessing reserved for the firstborn son. This is because even when the twins were still in the womb, Rebekah was already told by the Lord:
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“Two nations are in your womb
and two people born of you shall be divided;
the one shall be stronger than the other,
the elder shall serve the younger
-Genesis 25:23