“But God spoke in this way, that his ‘descendants would be foreigners in a land belonging to others, and they would enslave and mistreat them for four hundred years.
Then He said to Abram, “Know for certain that your seed will be strangers in a land that is not theirs, and they will be enslaved and oppressed 400 years.
What I am saying is this: Torah, which came 430 years later, does not cancel the covenant previously confirmed by God, so as to make the promise ineffective.