Genesis 41:29

New International Version

Seven years of great abundance are coming throughout the land of Egypt,

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The seven good cows are seven years, and the seven good heads of grain are seven years; it is one and the same dream.

but seven years of famine will follow them. Then all the abundance in Egypt will be forgotten, and the famine will ravage the land.

Joseph stored up huge quantities of grain, like the sand of the sea; it was so much that he stopped keeping records because it was beyond measure.