Exodus 12:40-42

Young's Literal Translation

⁴⁰ And the dwelling of the sons of Israel which they have dwelt in Egypt [is] four hundred and thirty years;

⁴¹ and it cometh to pass, at the end of four hundred and thirty years -- yea, it cometh to pass in this self-same day -- all the hosts of Jehovah have gone out from the land of Egypt.

⁴² A night of watchings it [is] to Jehovah, to bring them out from the land of Egypt; it [is] this night to Jehovah of watchings to all the sons of Israel to their generations.