Exo 1:8-9
“There arose a new king over Egypt, who knew not Joseph.” ויּקם signifies he came to the throne, קוּם denoting his appearance in history, as in Deu 34:10. A “new king” (lxx: βασιλεὺς ἕτερος; the other ancient versions, rex novus) is a king who follows different principles of government from his predecessors. Cf. חדשׁים אלהים, “new gods,” in distinction from the God that their fathers had worshipped, Jdg 5:8; Deu 32:17. That this king belonged to a new dynasty, as the majority of commentators follow Josephus in assuming, cannot be inferred with certainty from the predicate new; but it is very probable, as furnishing the readiest explanation of the change in the principles of government. The question itself, however, is of no direct importance in relation to theology, though it has considerable interest in connection with Egyptological researches.
The new king did not acknowledge Joseph, i.e., his great merits in relation to Egypt. ידע לא signifies here, not to perceive, or acknowledge, in the sense of not wanting to know anything about him, as in 1Sa 2:12, etc. In the natural course of things, the merits of Joseph might very well have been forgotten long before; for the multiplication of the Israelites into a numerous people, which had taken place in the meantime, is a sufficient proof that a very long time had elapsed since Joseph’s death. At the same time such forgetfulness does not usually take place all at once, unless the account handed down has been intentionally obscured or suppressed. If the new king, therefore, did not know Joseph, the reason must simply have been, that he did not trouble himself about the past, and did not want to know anything about the measures of his predecessors and the events of their reigns. The passage is correctly paraphrased by Jonathan thus: non agnovit (חכּים) Josephum nec ambulavit in statutis ejus. Forgetfulness of Joseph brought the favour shown to the Israelites by the kings of Egypt to a close. As they still continued foreigners both in religion and customs, their rapid increase excited distrust in the mind of the king, and induced him to take steps for staying their increase and reducing their strength. The statement that “the people of the children of Israel” (ישׂראל בּני עם lit., “nation, viz., the sons of Israel;” for עם with the dist. accent is not the construct state, and ישראל בני is in apposition, cf. Ges. §113) were “more and mightier” than the Egyptians, is no doubt an exaggeration.