Shemot 12:40-42

Orthodox Jewish Bible

⁴⁰ Now the moshav (time period of residence) of the Bnei Yisroel dwelling in Mitzrayim was four hundred and thirty shanah.

⁴¹ And it came to pass at the ketz (end) of the four hundred and thirty shanah, even the exact day it came to pass, that kol Tzivos Hashem went out from Eretz Mitzrayim.

⁴² It is a night of shimmurim (keepings, watchings, vigils) for Hashem to keep watch to bring them out from Eretz Mitzrayim; this is halailah hazeh unto Hashem; shimmurim (watchings, vigils) for kol Bnei Yisroel in their dorot.