Jacob pretended to be Esau and deceived his father Isaac. and received the blessing. 

Therefore God give thee of the dew of heaven, and the fatness of the earth, and plenty of corn and wine:

Let people serve thee, and nations bow down to thee: be lord over thy brethren, and let thy mother's sons bow down to thee: cursed be every one that curseth thee, and blessed be he that blesseth thee.

Genesis 27:28-29

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