Miketz 

מקץ

Joseph becomes the ruler over all of Egypt. The Sages relate that it was necessary for Joseph to receive heavenly assistance to teach him regal comportment – which served to his benefit in the future. 

At the moment that Pharaoh said to Joseph: “And without you no man shall lift his hand or his foot in the entire land of Egypt” (Genesis 41:44), Pharaoh’s astrologers said: Would you appoint a slave, whose master purchased him for twenty silver shekels, as ruler over us? Pharaoh said to them: I see regal comportment in him. They said to Pharaoh: If so, he should know seventy languages, as kings do. Gavriel came and taught Joseph seventy languages. The next day, no matter what language Pharaoh spoke with Joseph, Joseph responded to him. Joseph spoke in the sacred tongue, Hebrew, and Pharaoh did not know what he said. Pharaoh said to him: Teach me. Joseph taught him but he did not learn. Pharaoh said to him: Take an oath promising me that you will not reveal that you know a language I do not know. Joseph took an oath promising him. When Joseph later said to Pharaoh, after Jacob’s death: “My father administered an oath to me, saying: Behold, I am dying; in my grave that I dug for myself in the land of Canaan,<source>(<i>Sota</i> 36b) </source>