John Wesley on Exodus 12:40

It was just four hundred and thirty years from the promise made to Abraham (as the Apostle explains it, Gal 3:17,) at his first coming into Canaan, during all which time the Hebrews, were sojourners in a land that was not theirs, either Canaan or Egypt. So long the promise God made to Abraham lay dormant and unfulfilled, but now, it revived, and things began to work towards the accomplishment of it. The first day of the march of Abraham's seed towards Canaan was four hundred and thirty years (it should seem, to a day) from the promise made to Abraham, Gen 12:2. I will make of thee a great nation.